How to easily update your Debian Buster installation to Bullseye easily. This is not too hard at all.
1. Make sure all your packages are up to date. Run sudo apt update && sudo apt upgrade.
2. Make sure gcc-8-base is installed and up to date.
3. Edit your /etc/apt/sources.list and comment out the old buster lines and replace them with the content below.
deb http://deb.debian.org/debian bullseye main contrib non-free deb http://deb.debian.org/debian bullseye-updates main contrib non-free deb http://security.debian.org/debian-security bullseye-security main deb http://ftp.debian.org/debian bullseye-backports main contrib non-free |
4. Run the sudo apt update and then the apt full-upgrade commands to fully update the system.
5. Reboot and everything should work fine.
6. Clean all the obsolete and downloaded packages with the apt autoremove && apt autoclean commands.
7. Done.
