This article contains mainly the useful stuff I found in the Internet, but there are some things which I developed myself. This is my cheat-sheet, in order not to search the web again. If it turns out to be useful for somebody else, I will only be glad. These settings were made for Ubuntu 20.04 LTS.

Here’s the previous version for Ubuntu 16.04 LTS: Ubuntu16_settings.txt
Here’s the previous version for Ubuntu 18.04 LTS: Ubuntu18_settings.txt

((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
======================================== Initial setup ===============================

#=================== Simple GUI adjustments ==========================
- Desktop backround solid color: gsettings set org.gnome.desktop.background primary-color 'rgb(66, 81, 100)'
- remove unneccessary icons from the launcher
- Dock icon size = 32
- Language Support + Regional Formats
- keyboard repeat delay: Settings > Universal Access > Typing > Repeat keys
- Keyboard shortcuts: Ctrl-Shift-Esc = gnome-system-monitor
- Mount NTFS volumes
- Nautilus Bookmarks: drag and drop
- Shortcuts on desktop
- login to Firefox

#========================== Make Linux use 'Local' time ==========================
timedatectl set-local-rtc 1

#================ Set the grub timeout and the grub default boot entry ===========

sudo gedit /etc/default/grub
sudo update-grub


====================================== Mount NTFS partition in fstab =======================

sudo mkdir /media/d1
sudo mkdir /media/d2
sudo mkdir /media/cloud
sudo blkid
sudo gedit /etc/fstab

UUID=1185b49e-0551-42c5-8510-3149f2964b8a none            swap    sw              0       0
UUID=6f5d0096-211f-4e9b-8a32-ba242fa86017 /media/cloud auto nosuid,nodev,nofail,x-gvfs-show 0 0
tmpfs /tmp tmpfs defaults,noatime,nosuid,nodev,mode=1777,size=16384M 0 0
UUID=7020AE1B20ADE874 /media/d1 ntfs-3g permissions,windows_names,locale=en_US.utf8 0 0
UUID=00C0C2ECC0C2E6CE /media/d2 ntfs-3g permissions,windows_names,locale=en_US.utf8 0 0

sudo mount -a


============================ /tmp directory in RAM ===================
sudo gedit /etc/fstab

tmpfs /tmp tmpfs defaults,noatime,nosuid,nodev,mode=1777,size=8192M 0 0

#=================== Disable Gnome animation =========================

sudo apt install gnome-tweak-tool

1. General > Animations = Off


============ Laptop goes to sleep with lid closed before login and after logout ===============
Gnome Tweaks > General > Suspend when laptop lid is closed

OR

sudo gedit /etc/systemd/logind.conf

Search for these lines and make them look like this (possibly by removing # in front or replacing suspend with ignore):

HandleLidSwitch=ignore
HandleLidSwitchDocked=ignore

=============== Double Commander ======================

Install Snap version from Ubuntu software

sudo apt install libssh2-1
sudo rm -rf /root/.config/doublecmd
sudo cp -r /home/drew/.config/doublecmd /root/.config/doublecmd

OR

sudo sh -c "echo 'deb http://download.opensuse.org/repositories/home:/Alexx2000/xUbuntu_18.04/ /' > /etc/apt/sources.list.d/home:Alexx2000.list"
wget -nv https://download.opensuse.org/repositories/home:Alexx2000/xUbuntu_18.04/Release.key -O Release.key
sudo apt-key add - < Release.key sudo apt update sudo apt install doublecmd-gtk sudo apt install libssh2-1 Configuration > Options > File views > Sorting directorie = sort like files and show first
Configuration > Options > File views > Formatting > * format = B
Configuration > Options > Fonts-Main font, Path font
Configuration > Options > Icons -- 16x16
Configuration > Options > Layout -- Show toolbar = off, Show function key buttons = off

Configuration > Options > Keys > Hot keys > cm_LeftOpenDrives = Alt-1 and cm_RightOpenDrives = Alt-2 (because Alt-F1 and Alt-F2 are taken by Gnome)

Configuration > Options > Behaviors > Drive black list:
/home/ssh-ate/*;/run/user/1000/gvfs;/media/drew/Win;*telegram-desktop.mnt;/run/snapd/ns*;/home/guests/Inbox-d2;/home/guests/video;/home/drew/.cache/doc;/run/user/1000/doc;/var/lib/docker*;/run/docker*;*gmail.com;/run/vmblock-fuse;*1005/doc;*@gmail.com*


================ Install 7zip and rar ===========================================
sudo apt-get update
sudo apt-get install rar unrar xz-utils p7zip-rar p7zip-full


====================== Unrar in Double Commander ===============

https://onformix.blogspot.com/2017/10/dc-libunrar.so.html
Download GTK2 portable version, unpack libunrar.so and put it to /lib


wget https://jztkft.dl.sourceforge.net/project/doublecmd/DC%20for%20Linux%2064%20bit/Double%20Commander%200.9.9%20beta/doublecmd-0.9.9.gtk2.x86_64.tar.xz
tar -xpJf doublecmd-0.9.9.gtk2.x86_64.tar.xz doublecmd/libunrar.so
sudo mv doublecmd/libunrar.so /lib
rm doublecmd-0.9.9.gtk2.x86_64.tar.xz

============== Cyrillic characters in Windows archives ================
sudo apt-add-repository ppa:hanipouspilot/file-roller
sudo apt-get install file-roller


===================== Enable Edit As Administrator =====================

sudo apt install nautilus-admin
sudo nautilus -q


=========== Install LibreOffice via PPA (snap version is slow) =======================

sudo add-apt-repository ppa:libreoffice/ppa
sudo apt-get install libreoffice

To uninstall:
	sudo apt-get install ppa-purge && sudo ppa-purge ppa:libreoffice/ppa

Link colors in LibreOffice Calc: Tools > Options > LibreOffice > Application Colors > Text Document > Field Shading

============== Install Thunderbird from PPA (snap version is old) ==============

sudo add-apt-repository ppa:mozillateam/ppa
sudo apt install thunderbird
sudo apt install xul-ext-lightning

To uninstall -- sudo apt-get install ppa-purge && sudo ppa-purge ppa:mozillateam/ppa

=====================================================

================== Google calendar to accept invitations in Thunderbird 60 ===================

- In Preferences > Advanced (Tab) > General (stealthy subtab) > Config Editor (Button)
- Search for "calendar.google.enableEmailInvitations" and ensure the property is set to true
- Go to the calendar you want to use with your email, right click it and select "Properties"
- Change the "Email" field to the account you want to process invites for
- Click "OK"
- Go to an email invitation and you should now see the accept and decline buttons.


#==================== Install Notepadqq ==================

sudo snap install --classic notepadqq
Then allow access to removable storage devices in Ubuntu software > notepadqq > Permissions

=========================================== User groups ==================================
sudo addgroup GROUP

sudo adduser USERNAME GROUP

groups USERNAME


================================= Share folder for Windows ===============================
sudo apt install samba

sudo useradd user2
sudo smbpasswd -a user2

sudo gedit /etc/hostname

sudo gedit /etc/samba/smb.conf
[global]
usershare owner only = false

workgroup = ATE

and add to the end of the file:
[User2]
path = /media/d1/User2
available = yes
valid users = user2
read only = no
browsable = yes
public = yes
writable = yes

[Pics]
path = /media/d1/Pics
available = yes
valid users = user2
read only = no
browsable = yes
public = yes
writable = yes

path = /media/d2/video
available = yes
valid users = user2
read only = no
browsable = yes
public = yes
writable = yes


sudo gedit /etc/security/limits.conf
add to the end:
* - nofile 16384
root - nofile 16384

sudo service smbd restart

================================ Mount Windows Share =======================

https://ubuntuforums.org/showthread.php?t=2078120

sudo apt-get install cifs-utils

sudo mkdir /media/drew/drew-pc-d
sudo mkdir /media/drew/drew-pc-e

sudo gedit ~/.smbcredentials
username=msusername
password=mspassword

sudo chmod 600 ~/.smbcredentials

sudo gedit /etc/fstab

//drew-pc/d /media/drew_d cifs credentials=/home/drew/.smbcredentials,uid=1000,iocharset=utf8 0 0
//drew-pc/e /media/drew_e cifs credentials=/home/drew/.smbcredentials,uid=1000,iocharset=utf8 0 0

sudo mount -a


=================== Install Skype =================================================
Install from Ubuntu Software

OR

cd ~/Downloads
wget https://go.skype.com/skypeforlinux-64.deb
sudo dpkg -i skypeforlinux-64.deb
rm skypeforlinux-64.deb

If Skype doesn't save the password:
    In the Ubuntu launch menu, type password to find the utility Passwords and Keys. Open this utility.
    In the panel on the left you should see an entry Login in the section Passwords. Right click on Login, and select Change Password from the pop-up menu.
    You'll need to enter your current password first, then it asks for a new password
    Just leave the fields blank and press Continue.


=================== Install Viber =================================================

cd ~/Downloads

wget http://download.cdn.viber.com/cdn/desktop/Linux/viber.deb
sudo dpkg -i viber.deb
rm viber.deb

For Startup -- /opt/viber/Viber


# If problem with libssl1.1 then:
wget http://security.ubuntu.com/ubuntu/pool/main/o/openssl1.0/libssl1.0.0_1.0.2n-1ubuntu5.3_amd64.deb
sudo dpkg -i libssl1.0.0_1.0.2n-1ubuntu5.3_amd64.deb
rm libssl1.0.0_1.0.2n-1ubuntu5.3_amd64.deb


============== Install Telegram =============

sudo snap install telegram-desktop


================ Start Chrome with a certain profile ================

google-chrome --profile-directory=Default
google-chrome --profile-directory="Profile 1"


==================== VMware Workstation Player ========================

cd ~/Downloads
https://www.vmware.com/go/getplayer-linux
wget https://download3.vmware.com/software/player/file/VMware-Player-15.5.6-16341506.x86_64.bundle
sudo bash VMware-Player-15.5.6-16341506.x86_64.bundle
rm VMware-Player-15.5.6-16341506.x86_64.bundle


sudo gedit /etc/vmware/config
	prefvmx.minVmMemPct = "100"

#If secure boot is enabled:
sudo vmware-modconfig --console --install-all
# then install Virtualbox and proceed with Secure Boot activation there


========================== Install Virtualbox 6.1.10 ===================

Install from Ubuntu software
OR
sudo apt install virtualbox

cd ~/Downloads
wget https://download.virtualbox.org/virtualbox/6.1.10/Oracle_VM_VirtualBox_Extension_Pack-6.1.10.vbox-extpack
sudo virtualbox Oracle_VM_VirtualBox_Extension_Pack-6.1.10.vbox-extpack
rm Oracle_VM_VirtualBox_Extension_Pack-6.1.10.vbox-extpack

sudo adduser $USER vboxusers


#For Secure boot (together with VMware):
cd /home/drew/.ssh
openssl req -new -x509 -newkey rsa:2048 -keyout MOK.priv -outform DER -out MOK.der -nodes -days 36500 -subj "/CN=drew/"
sudo su
/usr/src/linux-headers-`uname -r`/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n vboxdrv)
/usr/src/linux-headers-`uname -r`/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n vmmon)
/usr/src/linux-headers-`uname -r`/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n vmnet)
mokutil --import MOK.der

Use BIOS pass for mokutil. Then reboot your machine and follow the instructions to complete the enrollment from the UEFI console. Check the enrollment:
sudo mokutil --test-key MOK.der

More details at:
https://gist.github.com/gabrieljcs/68939c7eeadfabfdbc6b40100130270d
https://askubuntu.com/questions/760671/could-not-load-vboxdrv-after-upgrade-to-ubuntu-16-04-and-i-want-to-keep-secur
https://kb.vmware.com/s/article/2146460


================= Install VIX API for VMWare Player (for headless mode) -- still doesn't work! ==================

sudo ln -s /usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libcanberra-gtk-module.so /usr/lib/libcanberra-gtk-module.so
sudo apt update
sudo apt install build-essential open-vm-tools
cd ~/Downloads
wget https://download3.vmware.com/software/player/file/VMware-VIX-1.17.0-6661328.x86_64.bundle
cp /usr/lib/vmware-installer/3.0.0/python/libpython3.7m.so.1.0 .
sudo rm -rf /etc/vmware-installer
sudo sh VMware-VIX-1.17.0-6661328.x86_64.bundle
wget https://download3.vmware.com/software/player/file/VMware-Player-15.5.5-16285975.x86_64.bundle
sudo sh VMware-Player-15.5.5-16285975.x86_64.bundle
rm VMware-VIX-1.17.0-6661328.x86_64.bundle
rm VMware-Player-15.5.5-16285975.x86_64.bundle
rm libpython3.7m.so.1.0
sudo gedit /usr/lib/vmware-vix/vixwrapper-config.txt
Then add line:	player    19  vmdb  15.5.5 Workstation-14.0.0

To start VM in headless mode:
vmrun -T player start /home/common/vmware/Warez/Windows\ 10.vmx nogui

  
=================== Install Teamviewer =============================

sudo apt-get install libqt5x11extras5 qtdeclarative5-controls-plugin qtdeclarative5-dialogs-plugin
sudo apt-get -f install

cd ~/Downloads
wget https://download.teamviewer.com/download/linux/teamviewer_amd64.deb
sudo dpkg -i ~/Downloads/teamviewer_amd64.deb
rm teamviewer_amd64.deb

--------Login screen locked ----------------
sudo gedit /etc/gdm3/custom.conf
	WaylandEnable=false


============= Desktop shortcuts ============

gedit ~/Desktop/Chrome-home.desktop

#!/usr/bin/env xdg-open
[Desktop Entry]
Version=1.0
Type=Application
Terminal=false
Exec=/usr/bin/google-chrome --profile-directory=Default
Name=Chrome home
Comment=Chrome home
Icon=/opt/google/chrome/product_logo_256.png


gedit ~/Desktop/Chrome-work.desktop

#!/usr/bin/env xdg-open
[Desktop Entry]
Version=1.0
Type=Application
Terminal=false
Exec=/usr/bin/google-chrome --profile-directory="Profile 1"
Name=Chrome work
Comment=Chrome work
Icon=/opt/google/chrome/product_logo_256.png


Then allow execution in properties.


=============== Change display resolution ==============
xrandr --output HDMI-1 --mode 1920x1200
xrandr --output HDMI-1 --mode 1920x1080
xrandr --output HDMI-1 --mode 1280x960


======================= Slow start of Unison and some other software ===================

sudo apt install appmenu-gtk2-module appmenu-gtk3-module
reboot 



============== Sync folders -- Unison ==============

https://unix.stackexchange.com/questions/583058/unison-and-version-compiler-conflicts/583377#583377

Build the latest version from source (apt still contains old version with bugs):
Afterwards, check that /usr/bin/unison is not the same size as /usr/bin/unison-gtk2

==Without GUI==
cd ~/Downloads
sudo apt install ocaml-native-compilers
wget https://github.com/bcpierce00/unison/archive/master.zip
unzip master.zip
cd unison-master/
sudo make all && make test && sudo HOME=/usr make install
cd ..
rm -rf unison-master
rm master.zip

sudo apt remove ocaml-nox -y
sudo apt autoremove -y
sudo apt clean
====

==With GUI==
sudo apt install ocaml-native-compilers
sudo apt install libgtk2.0-dev liblablgtk2-ocaml liblablgtk-extras-ocaml-dev libcanberra-gtk-module
cd ~/Downloads
wget https://github.com/bcpierce00/unison/archive/master.zip
unzip master.zip
cd unison-master/
sudo make all && make test && sudo HOME=/usr make install
sudo cp ./src/unison /usr/bin/unison-gtk2
cd ..
rm -rf unison-master
rm master.zip
#cp ./unison /usr/bin/unison

sudo apt remove ocaml-nox -y
sudo apt autoremove -y
sudo apt clean

====

Profiles stored at /home/drew/.unison/*.prf

common.prf
# Helps out a lot on Windows
fastcheck = true

# place new files at the top of the list
sortnewfirst = true

# turn on ssh compression
rshargs = -C

# Do not sync permissions
dontchmod = true
perms = 0

ignore = Name Thumbs.db
ignore = Name *~
ignore = Name *.tmp
ignore = Name _SYNCAPP
ignore = Name metadata.xml


unison profilename -batch

========= Dropbox =================
Install from website:
https://www.dropbox.com/install-linux


================== Configure cron scheduled tasks ===========
touch ~/cronjobs.txt
gedit ~/cronjobs.txt
50 19 * * * unison d2Backup_ArchiveProjects -batch -dontchmod -perms 0
0 20 * * * unison d2Backup_Work -batch -dontchmod -perms 0
30 20 * * 5 sh ~/archive-work.sh

touch ~/archive-work.sh
gedit ~/archive-work.sh
#!/bin/sh
7z a -pPASSWORD /media/d2/Inbox-d2/Backup/Work-$(date +%Y-%m-%d).7z /media/d1/Work > archive-work.log

Make it hidden and executable:
chmod 700 ~/archive-work.sh

crontab -u drew ~/cronjobs.txt
crontab -l

grep CRON /var/log/syslog



============ Install OpenSSH =================
https://www.digitalocean.com/community/tutorials/how-to-enable-sftp-without-shell-access-on-ubuntu-16-04
https://en.wikibooks.org/wiki/OpenSSH/Cookbook/File_Transfer_with_SFTP#SFTP-only_Accounts

sudo apt install openssh-server

sudo mkdir -p /home/ssh-grp
sudo chown drew:grp /home/ssh-grp
sudo chgrp grp /home/ssh-grp

sudo mkdir -p /home/ssh-grp/ftp-dir1
sudo mkdir -p /home/ssh-grp/ftp-dir2

sudo chown root /home/ssh-grp


sudo gedit /etc/fstab
/media/d1/FTP/dir1 /home/ssh-grp/ftp-dir1 none bind
/media/d1/FTP/dir2 /home/ssh-grp/ftp-dir2 none bind



sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.factory-defaults
sudo gedit /etc/ssh/sshd_config

Port NNN
PermitRootLogin no
Subsystem sftp internal-sftp


#add to the end:

Match user drew
ChrootDirectory /media
ForceCommand internal-sftp
PasswordAuthentication yes
PermitTunnel no
AllowAgentForwarding no
AllowTcpForwarding no
X11Forwarding no

Match Group grp
ChrootDirectory /home/ssh-grp
ForceCommand internal-sftp
PasswordAuthentication yes
PermitTunnel no
AllowAgentForwarding no
AllowTcpForwarding no
X11Forwarding no




tail -f /var/log/auth.log

sudo systemctl restart ssh


================= Hide users ===============

printf "[User]\nSystemAccount=true" | sudo tee /var/lib/AccountsService/users/albina > /dev/null



=========== Firewall =============
https://www.digitalocean.com/community/tutorials/how-to-setup-a-firewall-with-ufw-on-an-ubuntu-and-debian-cloud-server

sudo apt-get install ufw
sudo ufw status
sudo ufw app list
sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow 11111/tcp
sudo ufw deny OpenSSH
sudo ufw allow Samba
sudo ufw deny CUPS
sudo ufw enable
sudo ufw status


=========== File permissions =======
http://manpages.ubuntu.com/manpages/xenial/en/man8/ntfs-3g.8.html

========================== Install Pulse Secure Client ===================


cd ~/Downloads
#wget http://trial.pulsesecure.net/clients/ps-pulse-linux-9.1r5.0-b151-ubuntu-debian-64-bit-installer.deb?mkt_tok=eyJpIjoiTUdFMllUWm1ZbUZtTmpSaiIsInQiOiJCOUE2RzdkQnpUdGJUUU16M1F3cjhoXC9Kc2NhQ09nRm41NEJlajJxcEJoK2xJZzBsMlwvcDZEM0FhbXlLSEtqVGtGbFNaSDZMd3ZDS2trdW5TMTZPVktzd0UyQ1NjYUdoTEpINlZtSkljenVhMFNvTjlDWkZvY0R0WGVWMnFGd0VaIn0%3D
wget http://trial.pulsesecure.net/clients/ps-pulse-linux-9.1r5.0-b151-ubuntu-debian-64-bit-installer.deb
sudo dpkg -i ps-pulse-linux-9.1r5.0-b151-ubuntu-debian-64-bit-installer.deb
cd /usr/local/pulse/
sudo sed -i "s/UBUNTU_VER\ \=\ 18\ \]/& \|\|\ [\ \$UBUNTU_VER\ \=\ 20 \]/" PulseClient_x86_64.sh
sudo ./PulseClient_x86_64.sh install_dependency_packages
sudo mkdir /usr/local/pulse/extra
sudo mkdir /usr/local/pulse/debs 
cd /usr/local/pulse/debs
sudo wget http://archive.ubuntu.com/ubuntu/pool/main/i/icu/libicu60_60.2-3ubuntu3_amd64.deb
sudo wget http://archive.ubuntu.com/ubuntu/pool/universe/w/webkitgtk/libjavascriptcoregtk-1.0-0_2.4.11-3ubuntu3_amd64.deb
sudo wget http://archive.ubuntu.com/ubuntu/pool/universe/w/webkitgtk/libwebkitgtk-1.0-0_2.4.11-3ubuntu3_amd64.deb
#sudo wget https://launchpad.net/ubuntu/+source/webkitgtk/2.4.11-4/+build/14964670/+files/libwebkitgtk-1.0-0_2.4.11-4_amd64.deb
cd /usr/local/pulse/extra
sudo dpkg -x /usr/local/pulse/debs/libicu60_60.2-3ubuntu3_amd64.deb .
sudo dpkg -x /usr/local/pulse/debs/libjavascriptcoregtk-1.0-0_2.4.11-3ubuntu3_amd64.deb .
sudo dpkg -x /usr/local/pulse/debs/libwebkitgtk-1.0-0_2.4.11-3ubuntu3_amd64.deb .
#sudo dpkg -x /usr/local/pulse/debs/libwebkitgtk-1.0-0_2.4.11-4_amd64.deb .
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/pulse/extra/usr/lib/x86_64-linux-gnu/
sudo apt-get install libenchant-dev

#Modify the desktop shortcut at :
sudo gedit /usr/share/applications/pulseUi.desktop
	Exec=/usr/bin/env LD_LIBRARY_PATH=/usr/local/pulse/extra/usr/lib/x86_64-linux-gnu:$LD_LIBRARY_PATH /usr/local/pulse/pulseUi


More details at:
https://askubuntu.com/questions/1135065/cant-run-pulse-secure-on-ubuntu-19-04-because-libwebkitgtk-1-0-so-0-is-missing
https://medium.com/@yildirimabdrhm/pulse-secure-client-installation-on-linux-8bc524088793


============ Disable Pidgin notifications ===============

Ctrl-U -- Libnotify Popups -- Configure plugin


==================== Resize images in Nautilus ==========================

sudo apt-get update
sudo apt-get install imagemagick -y
sudo apt install nautilus-image-converter
nautilus -q



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========= Useful commands for Raspberry Pi =============

# measure temperature
vcgencmd measure_temp

# config script
sudo raspi-config



============ Install Python 3.7 =================

sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-get install python3.7
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.7 1
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.8 2
sudo update-alternatives --set python /usr/bin/python3.7


=================== Install Firebird 3 ================

sudo apt install firebird3.0-server
sudo gedit /etc/firebird/3.0/databases.conf

sudo systemctl enable firebird3.0.service
sudo systemctl disable firebird3.0.service
sudo systemctl restart firebird3.0.service
sudo systemctl stop firebird3.0.service
sudo systemctl start firebird3.0.service


== OR:

sudo apt-get -y install libncurses5 libtommath1
sudo ln -s libtommath.so.1 /usr/lib/x86_64-linux-gnu/libtommath.so.0
cd ~/Downloads
wget -O- https://github.com/FirebirdSQL/firebird/releases/download/R3_0_5/Firebird-3.0.5.33220-0.amd64.tar.gz|tar -zxC /tmp
rm Firebird-3.0.5.33220-0.amd64.tar.gz
cd /tmp/Firebird-3.0.5.33220-0.amd64
sudo ./install.sh
cd ..
rm -rf Firebird-3.0.5.33220-0.amd64

sudo gedit /opt/firebird/databases.conf


sudo systemctl enable firebird-superserver
sudo systemctl disable firebird-superserver
sudo systemctl restart firebird-superserver
sudo systemctl stop firebird-superserver
sudo systemctl start firebird-superserver

===

telnet localhost 3050

========================== Login as another user in terminal ================

su - user2

su - #login as root

============= Separate output audio devices for each app ============================

sudo apt-get install pavucontrol

pavucontrol


========================== Fix "Failed to activate service 'org.bluez': timed out" error ==============

sudo systemctl enable bluetooth.service

OR

sudo apt-get remove pavucontrol


========================== Fix "Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice.0" error ==============
sudo apt purge spice-vdagent


============================= Fix "Couldn't get size: 0x800000000000000e" error ======================================
In BIOS : Security -> Secure Boot -> Secure Boot Mode -> [Standard]


================== Windows software ================

 - Dropbox -- from www.dropbox.com
 - Draftsight (http://dl-ak.solidworks.com/nonsecure/draftsight/2018SP1/draftSight.deb)
 - text editor: notepadqq (regular expressions not working), Geany, SciTE
 - File manager -- Double Commander
 - FTP server -- OpenSSH
 - video player -- VLC (Ubuntu software or sudo snap install vlc)
 - ultraISO -- UNetbootin + sudo apt-get install isomaster
 - photo manager -- digikam (alternatives: gThumb, KPhotoAlbum, Darktable, F-Spot, GTKRawGallery, Picty, Fotoxx)
 - ebook converter -- Calibre
 - audio capture -- Audio Recorder
 - audio editor -- Audacity
 - video capture (Screen recorder) -- Open Broadcaster Software (OBS)
 - video convert -- Handbrake (Selene?)
 - Video Editor  -- Kdenlive
 - PDF Reader -- Evince
 - PDF Editor --


============== Ready desktop shortcuts for all applications ===================

/usr/share/applications/
/var/lib/snapd/desktop/applications


============== Open As in Double Commander, also Add to Favorites (dock) ===================
~/.local/share/applications



======== Merge several mp3 files ================

sudo apt-get install mp3wrap
mp3wrap output.mp3 *.mp3



================= Install Docker from Ubuntu repo (the version from Docker repo is superfluous) =======================
sudo apt-get update
sudo apt-get remove docker docker-engine docker.io docker-ce docker-ce-cli containerd.io
sudo apt install docker.io docker-compose

sudo groupadd docker
sudo usermod -aG docker $USER
newgrp docker


sudo systemctl start docker
sudo systemctl enable docker
docker --version


=================== Docker PXE Server ===================

https://github.com/ferrarimarco/docker-pxe
OR
https://hub.docker.com/r/linuxserver/netbootxyz -- depends on external DHCP server, e.g. in OpenWRT:
Network -> DHCP and DNS -> TFTP Settings -> Network boot image:
netboot.xyz.kpxe,,192.168.1.2
netboot.xyz.efi,,192.168.1.2

mkdir /media/d1/Dist/OS/netbootxyz/win
sudo mount -o loop /media/d1/Dist/OS/Windows10_orig/WIN10_64_En.ISO /media/d1/Dist/OS/netbootxyz/win
sudo umount /media/d1/Dist/OS/netbootxyz/win

Shift+F10
wpeinit
net use S: \\192.168.1.2\dist /user:guest password
S:\os\netbootxyz\win\sources\setup.exe

===================== Reset keyring password ====================
sudo rm ~/.local/share/keyrings/login.keyring



============ htaccess for downloadbox ==================

AddType application/octet-stream .zip .gz

<FilesMatch ".gz">
Order Deny,Allow
Allow from All



RewriteEngine Off




================= Migrate website to new domain ====================
mysqldump -u USERNAME -p -h localhost DBNAME > db.sql
sed -i 's/OLD.SITE.COM/NEW.SITE.COM/g' db.sql
mysql -u USERNAME -p DBNAME < db.sql rm db.sql find /home/www/ -type f -exec \ sed -i 's/OLD\.SITE\.COM/NEW.SITE.COM/g' {} + ========================= Make clonezilla live USB ===================== Format a USB flash stick into FAT32 and label it CZILLA-USB cd ~/Downloads wget https://dotsrc.dl.osdn.net/osdn/clonezilla/71822/clonezilla-live-2.6.4-10-amd64.zip # wget https://dotsrc.dl.osdn.net/osdn/clonezilla/72474/clonezilla-live-2.6.5-21-i686.zip unzip clonezilla-live-2.6.4-10-amd64.zip -d /media/drew/CZILLA-USB rm clonezilla-live-2.6.4-10-amd64.zip sudo bash /media/drew/CZILLA-USB/utils/linux/makeboot.sh /dev/sdd4 ============================ Clonezilla -- make and restore partition image in batch/unattended mode ===================== For EFI boot mode: add the following text to grub.cfg file, which is located in /boot/grub directory on your live USB or CD. The text should be added before this line: menuentry "Clonezilla live (Default settings, VGA 800x600)"{ ((((((((((( Example for host OS -- one partition only menuentry "Make partition image unattended from sda3 to /dev/sdb1/Backup/HDD-Images/drew-pc/Ubuntu18/01-basic"{ search --set -f /live/vmlinuz linux /live/vmlinuz boot=live config noswap nolocales edd=on nomodeset noprompt ocs_prerun="mount /dev/sdb1 /mnt" ocs_prerun1="mount --bind /mnt/Backup/HDD-Images/drew-pc/Ubuntu18 /home/partimag/" ocs_live_run="ocs-sr -q2 -c -j2 -z1p -i 4096 -sfsck -scs -senc --batch -p reboot saveparts 01-basic sda3" ocs_live_extra_param="" ocs_live_keymap="NONE" keyboard-layouts=NONE ocs_live_batch="yes" ocs_lang="en_US.UTF-8" vga=788 ip=frommedia nosplash ocs_numlk=on initrd /live/initrd.img } menuentry "Restore partition image unattended from /dev/sdb1/Backup/HDD-Images/drew-pc/Ubuntu18/02-mainsoft to sda3"{ search --set -f /live/vmlinuz linux /live/vmlinuz boot=live config noswap nolocales edd=on nomodeset noprompt ocs_prerun="mount /dev/sdb1 /mnt" ocs_prerun1="mount --bind /mnt/Backup/HDD-Images/drew-pc/Ubuntu18 /home/partimag/" ocs_live_run="ocs-sr -g auto -e1 auto -e2 -r -j2 -k --batch -p reboot restoreparts 02-mainsoft sda3" ocs_live_extra_param="" ocs_live_keymap="NONE" keyboard-layouts=NONE keyboard-layouts=NONE ocs_live_batch="yes" ocs_lang="en_US.UTF-8" vga=788 ip=frommedia nosplash ocs_numlk=on initrd /live/initrd.img } )))))))))))) For legacy boot mode: add the following text to isolinux.cfg (loading from ISO image) or syslinux.cfg (loading from USB-flash stick) file, which is located in /syslinux directory on your live USB or CD. The text should be added after this line: MENU TITLE clonezilla.org, clonezilla.nchc.org.tw ((((((((((( Example for VirtualBox (shrinking VDI file size) -- whole disk label Clonezilla sda to sdb1-DiskImage MENU LABEL Make disk image unattended from sda to /dev/sdb1/DiskImage kernel /live/vmlinuz append initrd=/live/initrd.img boot=live config noswap nolocales edd=on nomodeset noprompt ocs_prerun="mount /dev/sdb1 /mnt" ocs_prerun1="mount --bind /mnt /home/partimag/" ocs_live_run="ocs-sr -q2 -j2 -z1p -i 4096 -sfsck -scs -senc --batch -p reboot savedisk DiskImage sda" ocs_live_extra_param="" ocs_live_keymap="NONE" keyboard-layouts=NONE ocs_live_batch="yes" ocs_lang="en_US.UTF-8" vga=788 ip=frommedia nosplash ocs_numlk=on TEXT HELP * Please check your params beforehand -- no more confirmations! ENDTEXT label Clonezilla sdb1-DiskImage to sda MENU LABEL Restore disk image unattended from /dev/sdb1/DiskImage to sda kernel /live/vmlinuz append initrd=/live/initrd.img boot=live config noswap nolocales edd=on nomodeset noprompt ocs_prerun="mount /dev/sdb1 /mnt" ocs_prerun1="mount --bind /mnt /home/partimag/" ocs_live_run="ocs-sr -g auto -e1 auto -e2 -r -j2 --batch -p reboot restoredisk DiskImage sda" ocs_live_extra_param="" ocs_live_keymap="NONE" keyboard-layouts=NONE keyboard-layouts=NONE ocs_live_batch="yes" ocs_lang="en_US.UTF-8" vga=788 ip=frommedia nosplash ocs_numlk=on TEXT HELP * Please check your params beforehand -- no more confirmations! ENDTEXT )))))))))))) Then replace the following parameters with your values in al places: sda3 -- imaged partition 03-all -- image name /dev/sdb1 -- drive that will store the image Backup/HDD-Images/drew-pc -- path on the drive that will store the image sda -- imaged drive When restoring the image with just one partition, first copy these files from the complete image: sda1.vfat-ptcl-img.gz.aa swappt-sda4.info ==================== Install and use partclone in Ubuntu Live USB =========================== #!/bin/sh sudo echo 'deb http://cz.archive.ubuntu.com/ubuntu bionic main universe' > /etc/apt/sources.list.d/partclone.list
sudo apt-get update
sudo apt-get install partclone


sudo mkdir /media/d1
sudo mount /dev/sdb1 /media/d1
sudo partclone.ext4 -N -c -s /dev/sda3 | gzip -c > /media/d1/Backup/HDD-Images/win10_last.gz


sudo mkdir /media/d1
sudo mount /dev/sdb1 /media/d1
sudo gzip -c -d /media/d1/Backup/HDD-Images/win10_last.gz | partclone.ext4 -N -r -o /dev/sda3

==================================== Edit ISO including bootable ones ==============================

sudo apt-get install isomaster

OR

https://poweriso.com/download-poweriso-for-linux.htm


======================= Create ramdisk and start Digikam with its DB on ramdisk -- but better make /tmp in RAM ====================
sudo mkdir /mnt/ramdisk

/opt/digikam/start_with_ramdisk.sh :

pkexec mount -t tmpfs -o rw,size=512M tmpfs /mnt/ramdisk
cp -r -f /home/drew/Documents/digikam_db /mnt/ramdisk
sh /opt/digikam/AppRun
cp -r -f /mnt/ramdisk/digikam_db /home/drew/Documents
#pkexec umount /mnt/ramdisk
#the ramdisk will be unmounted after the next reboot

==================== Export OpenWRT router config ===============

ssh [email protected] "uci export" > router.conf



#============================= Disable password prompt in sudo (convenient but not secure -- do not forget to change it back!) ==============================
#1.
sudo visudo

#Change:
%sudo ALL=(ALL:ALL) ALL
#to
%sudo ALL=(ALL) NOPASSWD:ALL

#2.
sudo nano /etc/polkit-1/localauthority/50-local.d/99-nopassword.pkla

[No password prompt]
Identity=unix-group:sudo
Action=*
ResultActive=yes



========================== Install openjdk 8 ==========================

sudo apt remove openjdk*
sudo apt purge openjdk*
sudo apt install openjdk-8-jdk openjdk-8-source

sudo update-java-alternatives --set java-1.8.0-openjdk-amd64
export JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:jre/bin/java::")


========================== Install openjxf 8 ==========================

sudo apt-mark unhold openjfx libopenjfx-jni libopenjfx-java
sudo apt remove openjfx
sudo apt purge openjfx
sudo apt update
sudo apt install openjfx=8u161-b12-1ubuntu2 libopenjfx-jni=8u161-b12-1ubuntu2 libopenjfx-java=8u161-b12-1ubuntu2
sudo apt-mark hold openjfx libopenjfx-jni libopenjfx-java

Then add /usr/share/java as global library in Project Structure


========================== Install openjdk 11 ==========================

sudo apt install openjdk-11-jdk openjdk-11-source

sudo update-java-alternatives --set java-1.11.0-openjdk-amd64
export JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:jre/bin/java::")


========================== Install openjxf 11 ==========================
sudo apt install openjfx
export PATH_TO_FX=/usr/share/openjfx/lib
export CLASSPATH=$CLASSPATH:/usr/share/java/openjfx/lib/

========================== Java enabled browser ==========================

palemoon


===================== Install Handbrake =============

sudo add-apt-repository ppa:stebbins/handbrake-releases
sudo apt-get update
sudo apt-get install handbrake-gtk
sudo apt-get install handbrake-cli

#for video passthrough use MKVToolNix


===================== Install MKVToolNix =============
wget -q -O - https://mkvtoolnix.download/gpg-pub-moritzbunkus.txt | sudo apt-key add -

sudo sh -c "echo 'deb https://mkvtoolnix.download/ubuntu/ bionic main\ndeb-src https://mkvtoolnix.download/ubuntu/ bionic main' > /etc/apt/sources.list.d/mkvtoolnix.download.list"

sudo apt update
sudo apt install mkvtoolnix mkvtoolnix-gui

==================== Install Selene ===========
sudo apt-add-repository -y ppa:teejee2008/ppa
sudo apt-get update
sudo apt-get install selene


=============== Install DraftSight ======================
cd ~/Downloads
wget http://dl-ak.solidworks.com/nonsecure/draftsight/2019SP1/draftSight.deb
sudo dpkg -i ~/Downloads/draftSight.deb


================ Install Audacity ================

Use Ubuntu Software -- may display error

sudo add-apt-repository ppa:ubuntuhandbook1/audacity
sudo apt-get update
sudo apt-get install audacity


============== Install Calibre ====================

sudo -v && wget -nv -O- https://download.calibre-ebook.com/linux-installer.py | sudo python -c "import sys; main=lambda:sys.stderr.write('Download failed\n'); exec(sys.stdin.read()); main()"


====================== Install Audio Recorder ===============

sudo add-apt-repository ppa:audio-recorder/ppa
sudo apt-get -y update
sudo apt-get install --reinstall audio-recorder


========== Install digikam -- /tmp should be in RAM ===============

#!/usr/bin/env xdg-open
[Desktop Entry]
Version=1.0
Type=Application
Terminal=false
Icon[en_US]=gnome-panel-launcher
Name[en_US]=Digikam
Exec=sh /home/drew/digikam/start_with_ramdisk.sh
Name=Digikam
Icon=/home/drew/digikam/digikam.png


== start_with_ramdisk.sh ==

#!/bin/bash

cd ~/digikam
if !(test -f "digikam-6.4.0-x86-64.appimage";) then
   wget https://download.kde.org/stable/digikam/6.4.0/digikam-6.4.0-x86-64.appimage
   chmod ug+x digikam-6.4.0-x86-64.appimage
fi

cp -r -f ~/digikam/digikam_db /tmp
~/digikam/digikam-6.4.0-x86-64.appimage
cp -r -f /tmp/digikam_db ~/digikam
rm -r -f /tmp/digikam_db

====

================== Install RDP ================

https://askubuntu.com/questions/592537/can-i-access-ubuntu-from-windows-remotely

sudo apt-get update
sudo apt-get install xrdp
sudo apt-get install xfce4

echo xfce4-session >~/.xsession

sudo gedit /etc/xrdp/startwm.sh

The content should look like this (pay attention to the last line and ignore . /etc/X11/Xsession):
"
#!/bin/sh

if [ -r /etc/default/locale ]; then
  . /etc/default/locale
  export LANG LANGUAGE
fi

startxfce4
"

sudo service xrdp restart



==================================== Mount shares inside vbox ==============================
https://gist.github.com/estorgio/1d679f962e8209f8a9232f7593683265


Install Guest Additions CD image...

sudo apt-get update
sudo apt-get install build-essential linux-headers-`uname -r`
sudo /media/cdrom/./VBoxLinuxAdditions.run
sudo shutdown -r now

mkdir /home/andrew/vboxshare
sudo mount -t vboxsf shared /home/drew/vboxshare

sudo nano /etc/fstab
shared	/home/drew/vboxshare	vboxsf	defaults	0	0

sudo nano /etc/modules
    Add the following line to /etc/modules and save
vboxsf

shutdown -r now


================ Remote desktop via VNC ===============

sudo apt update
sudo apt install -y vino dconf-editor

dconf-editor
Search «remote-access»

OR
/org/gnome/desktop/remote-access

gsettings set org.gnome.Vino require-encryption false



================= Install OpenVPN ===============
sudo apt-get update
sudo apt-get install openvpn
sudo openvpn --config /media/d1/configfile.ovpn


========================== Make ISO image =================
mkisofs -allow-lowercase -allow-multidot -J -joliet-long -jcharset utf-8 -o /media/d1/Pics/My_photo/Archive/2017.iso /media/d1/Pics/My_photo/2017


================ Download an offline website mirror, make and mount ISO image ===============
sudo apt-get install webhttrack

bash process_after_httrack.sh

sudo mkdir /media/drew/iso
sudo mount -o loop /media/d1/Stasia/offline-websites/doctorberezovska_com_2018-02-25.iso /media/drew/iso
sudo umount /media/drew/iso


-----------process_after_httrack.sh---------
#!/bin/bash

source_path=/media/d2/Temp/HTTrack
project_name=doctorberezovska_com
temp_path=/media/d1/Temp
iso_path=/media/d1/Stasia/offline-websites
url_prefix=http:/
pagename=index.html
basepath=$temp_path/$project_name


cp -r $source_path/$project_name $temp_path

rm -rf $basepath/hts-cache

#delete all folders "feed"
find $basepath -type d -name feed -exec rm -r {} \;

#delete all files index????.html
find $basepath -type f -name index????.html -exec rm -r {} \;

find $basepath -type f -name index.html -size 0c > empty_indexes.txt

#download empty index.html files
while read -ru 3 LINE; do

 #replace basepath with http prefix in each line
 urlpath=${LINE/$basepath/$url_prefix}

 #delete index.html in each line
 urlpath=${urlpath/$pagename}

 wget -k --output-document="$LINE" $urlpath

done 3< empty_indexes.txt find $basepath -type f -name *.html > all_html.txt

while read -ru 3 LINE; do

#Replace http://doctorberezovska.com/ with ../
#Some links are not replaced by HTTrack. This replacement will only work for level 1 pages, but they are the majority. A universal replacement is too complicated.
#Also delete trash after 
sed -i 's_http://doctorberezovska.com/_../_g;/<\/html>/q' $LINE

done 3< all_html.txt grep Error: $basepath/hts-log.txt >errors.txt
rm -rf $basepath/hts-log.txt

mkisofs -r -iso-level 4 -o $iso_path/$project_name"_"$(date +%Y-%m-%d).iso $basepath
rm -rf $basepath

----------------------------------------------


========================== Burn ISO e.g.  ================

sudo fdisk -l
sudo umount /dev/sdd
sudo dd bs=4M if=/media/d1/Dist/Util/Hdd-tools/WinPE10_8_Sergei_Strelec/WinPE10_Sergei_Strelec_x64_2018.01.05_English_lite.iso of=/dev/sdd status=progress oflag=sync

OR if bootable USB flash

sudo add-apt-repository ppa:gezakovacs/ppa
sudo apt-get update
sudo apt-get install unetbootin
sudo QT_X11_NO_MITSHM=1 /usr/bin/unetbootin

====================== SVN and Git GUI client =================

sudo add-apt-repository ppa:rabbitvcs/ppa
sudo apt-get update
sudo apt-get install rabbitvcs-cli rabbitvcs-core rabbitvcs-gedit rabbitvcs-nautilus rabbitvcs-nautilus3

sudo apt-get remove rabbitvcs*


OR
RapidSVN in UbuntuSoftware rep


=========================== Git save default username and password =====================

git config --global user.email "[email protected]"
git config --global user.name "Andrew Buldyzhov"

git config --global credential.helper store
git pull
git pull # to change the password
git pull

========== Download Youtube video ========

Find youtube-dl in Ubuntu software
OR
sudo wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/local/bin/youtube-dl
sudo chmod a+rx /usr/local/bin/youtube-dl


=============== On input source change the scroll lock toggles =======================

sudo gedit /etc/default/keyboard
XKBOPTIONS="grp:alt_shift_toggle,grp_led:scroll"
#XKBOPTIONS="grp:alt_shift_toggle"

gsettings reset org.gnome.desktop.input-sources xkb-options



========================= Batch resize images recursively =================================

sudo apt-get install build-essential checkinstall && apt-get build-dep imagemagick -y
cd ~/Downloads
wget https://www.imagemagick.org/download/ImageMagick.tar.gz
tar xf ImageMagick.tar.gz
cd ImageMagick-7*
./configure
make
sudo make install
sudo ldconfig /usr/local/lib


find . -name '*.jpg' -execdir mogrify -resize 1920x1440 {} \;
find . -name '*.JPG' -execdir mogrify -resize 1920x1440 {} \;
find . -name "*.jpg" | xargs mogrify -resize 50%
find . -name "*.JPG" | xargs mogrify -resize 50%

find . -name '*.png' -execdir mogrify -format jpg {} \;
find . -name '*.PNG' -execdir mogrify -format jpg {} \;


========== Disable MySQL from startup =========
sudo /etc/init.d/mysql stop
sudo systemctl disable mysql

sudo systemctl enable mysql
sudo /etc/init.d/mysql start


============== Install Maria DB ====================
sudo apt update
sudo apt install mariadb-server
sudo mysql_secure_installation

sudo mysql -u root
CREATE USER 'dbeaver'@'localhost' IDENTIFIED BY 'password';


sudo systemctl stop mariadb.service
sudo systemctl start mariadb.service
sudo systemctl restart mariadb.service
sudo systemctl enable mariadb.service
sudo systemctl disable mariadb.service
sudo systemctl status mariadb.service


=============== Rename all .MP3 to .mp3 files ===========
sudo apt install rename
rename 's/.MP3$/.xxx/' *.MP3
rename 's/.xxx$/.mp3/' *.xxx


============ Randomize (shuffle) all .mp3 files =================

for f in *.mp3 *.MP3; do mv "$f" $RANDOM.mp3; done


==================== Batch rename files in text editor =================
sudo apt install renameutils
qmv


======================= Install WireGuard on Raspbian ==================
sudo apt update && sudo apt upgrade -y
sudo apt-get install raspberrypi-kernel-headers
echo "deb http://deb.debian.org/debian/ unstable main" | sudo tee --append /etc/apt/sources.list.d/unstable.list
wget -O - https://ftp-master.debian.org/keys/archive-key-$(lsb_release -sr).asc | sudo apt-key add -
printf 'Package: *\nPin: release a=unstable\nPin-Priority: 150\n' | sudo tee --append /etc/apt/preferences.d/limit-unstable
sudo apt update
sudo apt install wireguard -y
which wg
which wg-quick


===================== Simple commands of Wireguard for two comps ======================

============ Peer1  -- acting as server ===========
umask 077
mkdir /home/USER1/wgkeys
cd /home/USER1/wgkeys
wg genkey | tee privatekey | wg pubkey > publickey
cat /home/USER1/wgkeys/publickey
sudo ip link add dev wg0 type wireguard
sudo ip address add dev wg0 192.168.3.1 peer 192.168.3.2
sudo wg set wg0 listen-port 11111 private-key /home/USER1/wgkeys/privatekey peer PEER2_PUBLIC_KEY allowed-ips 192.168.3.0/24 persistent-keepalive 25
sudo ip link set wg0 up
sudo wg

============ Peer2  -- acting as client ===========
umask 077
mkdir /home/USER2/wgkeys
cd /home/USER2/wgkeys
wg genkey | tee privatekey | wg pubkey > publickey
cat /home/USER2/wgkeys/publickey
sudo ip link add dev wg0 type wireguard
sudo ip address add dev wg0 192.168.3.2 peer 192.168.3.1
sudo wg set wg0 private-key /home/USER2/wgkeys/privatekey peer PEER1_PUBLIC_KEY allowed-ips 192.168.3.0/24 endpoint PEER1_DOMAIN_OR_IP:11111 persistent-keepalive 25
sudo ip link set wg0 up
sudo wg


===================== Simple config of Wireguard for two comps -- persistent after reboot ======================

============ Peer1  -- acting as server ===========
wg genkey | tee privatekey | wg pubkey > publickey
cat privatekey
cat publickey

sudo vim /etc/wireguard/wg0.conf
"""""
[Interface]
Address = 192.168.3.1
ListenPort = 11111
PrivateKey = PEER1_PRIVATE_KEY

[Peer]
PublicKey = PEER2_PUBLIC_KEY
AllowedIPs = 192.168.3.0/24
PersistentKeepalive = 25
"""""
sudo wg-quick up wg0
sudo systemctl enable wg-quick@wg0
sudo wg
ping 192.168.3.2

============ Peer2  -- acting as client ===========
wg genkey | tee privatekey | wg pubkey > publickey
cat privatekey
cat publickey
sudo vim /etc/wireguard/wg0.conf
"""""
[Interface]
Address = 192.168.3.2
PrivateKey = PEER2_PRIVATE_KEY

[Peer]
PublicKey = PEER1_PUBLIC_KEY
AllowedIPs = 192.168.3.0/24
Endpoint = PEER1_DOMAIN_OR_IP:11111
PersistentKeepalive = 25
"""""

sudo wg-quick up wg0
sudo systemctl enable wg-quick@wg0
sudo wg
ping 192.168.3.1


================ Find and remove installed package ==============
apt list --installed | grep imager

sudo apt-get remove rpi-imager
sudo dpkg --remove rpi-imager


================================ Clean up ==========
sudo apt autoremove
sudo apt clean

sudo journalctl --vacuum-time=1m

dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge

sudo rm -rfv /var/lib/snapd/cache
sudo mkdir /var/lib/snapd/cache


sudo sh delete_old_snaps.sh
#!/bin/bash
# Removes old revisions of snaps
# CLOSE ALL SNAPS BEFORE RUNNING THIS
set -eu
snap list --all | awk '/disabled/{print $1, $3}' |
    while read snapname revision; do
        snap remove "$snapname" --revision="$revision"
    done