After-Basic-Install

Enable contrib and non-free sources

Edit /etc/apt/sources.list and append non-free contrib to each line

deb http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware 
deb-src http://deb.debian.org/debian bookworm main contrib non-free non-free-firmware

deb http://deb.debian.org/debian-security/ bookworm-security main contrib non-free non-free-firmware
deb-src http://deb.debian.org/debian-security/ bookworm-security main contrib non-free non-free-firmware

deb http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware
deb-src http://deb.debian.org/debian bookworm-updates main contrib non-free non-free-firmware

Enable bookworm backports

Edit /etc/apt/sources.list and insert the following lines to the end of the file

# bookworm-backports
deb http://deb.debian.org/debian bookworm-backports main contrib non-free
deb-src http://deb.debian.org/debian bookworm-backports main contrib non-free

Enable Flatpak support

sudo apt install flatpak

sudo flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

Changes will take effect after logging out or rebooting the system

Example usage flatpak install <application name>

KDE Plasma flatpak support

sudo apt install plasma-discover-backend-flatpak

Gnome Software flatpak support

sudo apt install gnome-software-plugin-flatpak

Manually install latest Firefox version into /opt

Download latest Firefox tarball from Mozilla (update link for your language) and extract it into /opt sudo wget -O /tmp/firefox-latest.tar.bz2 'https://download.mozilla.org/?product=firefox-latest-ssl&os=linux64&lang=en-GB' && sudo tar -C /opt -xvjf /tmp/firefox-latest.tar.bz2

Create firefox.desktop file in /usr/share/applications

sudo nano /usr/local/share/applications/firefox.desktop

[Desktop Entry]
Name=Firefox Stable
Comment=Web Browser
Exec=/opt/firefox/firefox %u
Terminal=false
Type=Application
Icon=/opt/firefox/browser/chrome/icons/default/default128.png
Categories=Network;WebBrowser;
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/vnd.mozilla.xul+xml;application/rss+xml;application/rdf+xml;image/gif;image/j>
StartupNotify=true
Actions=Private;

[Desktop Action Private]
Exec=/opt/firefox/firefox --private-window %u
Name=Open in private mode

To use Firefox with Wayland you can either change the Exec lines to include the MOZ_ENABLE_WAYLAND=1 environment variable

Exec=env MOZ_ENABLE_WAYLAND=1 /opt/firefox/firefox %u

Exec=env MOZ_ENABLE_WAYLAND=1 /opt/firefox/firefox --private-window %u

Or set the environment in /etc/environment

sudo nano /etc/environment MOZ_ENABLE_WAYLAND=1

Create symlink from the Firefox executable in /opt/firefox/firefox to /usr/local/bin/firefox to run Firefox from terminal sudo ln -s /opt/firefox/firefox /usr/local/bin/firefox

Script to update Firefox

#! /bin/bash
sudo wget -O /tmp/firefox-latest.tar.bz2 'https://download.mozilla.org/?product=firefox-latest-ssl&os=linux64&lang=en-GB' &&
sudo rm -R /opt/firefox &&
sudo tar -C /opt -xvjf /tmp/firefox-latest.tar.bz2

Remove firefox-esr (optional, don't autoremove any Firefox dependencies)

sudo apt remove firefox-esr

Alternatively you can install the latest version of Firefox as a Flatpak.

Enable pipewire (Plasma only, pipewire is already the default audio server in Gnome desktop)

Install required packages

sudo apt install libspa-0.2-bluetooth wireplumber pipewire-media-session-

Enable WirePlumber in "systemd" (running as user, not as root)

systemctl --user --now enable wireplumber.service

Changes will take effect after rebooting the system

Install and configure KVM / virt-manager

Install required packages

sudo apt install qemu-system libvirt-daemon-system virt-manager

Edit the libvirtd configuration

sudo nano /etc/libvirt/libvirtd.conf

Set the domain socket group ownership to libvirt

unix_sock_group = "libvirt"

Adjust the UNIX socket permissions for the R/W socket

unix_sock_rw_perms = "0770"

Start and enable the libvirtd service

sudo systemctl start libvirtd

sudo systemctl enable libvirtd

Add user to libvirt group

sudo usermod -a -G libvirt $(whoami)

Start "default" network and enable autostart

sudo virsh net-start default

sudo virsh net-autostart --network default


Remove pre-installed Gnome games (Gnome desktop only)

sudo apt purge iagno lightsoff four-in-a-row gnome-robots pegsolitaire gnome-2048 hitori gnome-klotski gnome-mines gnome-mahjongg gnome-sudoku quadrapassel swell-foop gnome-tetravex gnome-taquin aisleriot gnome-chess five-or-more gnome-nibbles tali ; sudo apt autoremove
Fix broken QT application theming in Gnome

sudo apt install qt5-style-plugins

echo "export QT_QPA_PLATFORMTHEME=gtk2" >> ~/.profile

Changes will take effect after logging out or rebooting the system
Disable suspend / hibernation

Create new directory /etc/systemd/sleep.conf.d

sudo mkdir /etc/systemd/sleep.conf.d

Create a nosuspend.conf file as

sudo nano /etc/systemd/sleep.conf.d/nosuspend.conf

[Sleep]
AllowSuspend=no
AllowHibernation=no
AllowSuspendThenHibernate=no
AllowHybridSleep=no

To only prevent suspending when the laptop lid is closed set the following options in /etc/systemd/logind.conf

sudo nano /etc/systemd/logind.conf

[Login]
HandleLidSwitch=ignore
HandleLidSwitchDocked=ignore

Fix slow shutdown

The default time-out for a stop job is 90s. This is excessively long.

The time can be changed by editing the /etc/systemd/system.conf

sudo nano /etc/systemd/system.conf

Uncomment the DefaultTimeoutStopSec line and change from 90s to 15s

DefaultTimeoutStopSec=15s