Things to do first on Debian 12

1. disable raspi-firmware error

apt autoremove --purge raspi-firmware

sudo rm -rf /etc/initramfs/post-update.d/z50-raspi-firmware
 

2. Install Bash auto complete 

 apt-get install bash-completion

3.LVM Shares not showing

sudo apt install lvm2

4. Installing Gnome Disks

sudo apt install gnome-disk-utilities 

5. Installing Kvantum

sudo apt install qt5-style-kvantum

5. Adding ppa repositories

 sudo apt install software-properties-common python3-launchpadlib

6. Auto start/shutdown kvm virtual machines from command line

sudo virsh autostart node1

sudo virsh autostart PFS --disable
 

7. Debian Network Bridge 

# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback

# Set up interfaces manually, avoiding conflicts with, e.g., network manager
iface eth0 inet manual
iface eth1 inet manual

auto br0
iface br0 inet static
address 192.168.151.2
netmask 255.255.255.0
broadcast 192.168.151.255
gateway 192.168.151.1
dns-nameservers 192.168.151.1
bridge_ports eth0, eth1
bridge_stp off
bridge_fd 0
bridge_maxwait 0

8. Adding swapiness Value

sudo nano /etc/sysctl.d/vm.swappiness.conf

vm.swappiness =2

 

vm.vfs_cache_pressure = 50

 

 

 

 

9. X11VNC on Debian/Ubuntu

1. Update & install packages:

   apt-get update && apt-get install -y x11vnc
   

2. Store VNC password:

   x11vnc -storepasswd /etc/x11vnc.passwd
   chmod 0400 /etc/x11vnc.passwd
   

3. Edit /lib/systemd/system/x11vnc.service:

   [Unit]
   Description=Start x11vnc
   After=multi-user.target
   
   [Service]
   Type=simple
   ExecStart=/usr/bin/x11vnc -display :0 -auth guess -forever -loop -noxdamage -repeat -localhost -rfbauth /etc/x11vnc.passwd -rfbport 5900 -shared
   
   [Install]
   WantedBy=multi-user.target
   

4. Enable & start x11vnc service:

   systemctl enable x11vnc.service
   systemctl start x11vnc.service
   

5. Connect to the VNC server from a remote machine with SSH local port forwarding:

   ssh -L 5901:127.0.0.1:5900

   or

   crontab -e

   @reboot x11vnc 

   10. Getting syslog back

   sudo apt install rsyslog 

   11. cups Service  not stopping 

   sudo systemctl mask cups
   sudo systemctl disable cups
   sudo systemctl disable cups.service cups.socket cups.path
   sudo systemctl disable cups-browsed.service

12. start networking manually 

sudo crontab -e

@reboot sudo ip link set enp3s0 up


13. Time not correct

sudo apt install systemd-timesyncd
sudo nano  /etc/systemd/timesyncd.conf

set
NTP=<IP_of_your_NTP_Server>

timedatectl

14. Disable IPv6 with nmcli

sudo nmcli connection modify br0 ipv6.method "disabled"

15. Adding Bridge Network using nmcli

 The steps for creating a network bridge on a system using QEMU-KVM are these:

nmcli connection show
sudo nmcli connection add type bridge autoconnect yes con-name br0 ifname br0
sudo nmcli connection modify br0 ipv4.addresses 10.10.3.49/24 gw4 10.10.3.1 ipv4.method manual
sudo nmcli connection modify br0 ipv4.dns 10.10.3.6
sudo nmcli connection del "Wired Connection 1"
sudo nmcli connection add type bridge-slave autoconnect yes con-name enp1s0 ifname enp1s0 master br0
sudo nmcli connection up br0
nmcli connection show br0
ip add show br0 

16. Revert back to Ethernet old naming scheme  

sudo nano /etc/default/grub 

add this line to GRUB_CMDLINE_LINUX= 

net.ifnames=0 biosdevname=0

sudo update-grub

17.Install latest firefox

cd ~/Downloads

tar xjf firefox-*.tar.bz 

sudo mv firefox /opt

ln -s /opt/firefox/firefox /usr/local/bin/firefox

wget https://raw.githubusercontent.com/mozilla/sumo-kb/main/install-firefox-linux/firefox.desktop -P /usr/local/share/applications

 

18. auto start apps on boot kde only

sudo kwriteconfig5 --file startkderc --group General --key systemdBoot false

kwriteconfig5 --file startkderc --group General --key systemdBoot false

 

19. Install Gnome Network Manager

sudo apt install network-manager-gnome



19. all categories missing error

Update in this file:

/usr/share/knsrcfiles/lookandfeel.knsrc

Update

Categories=121

With

Categories=Global Themes (Plasma 5)