sudo apt update && sudo apt upgrade -y
sudo nano /etc/apt/sources.list
deb http://deb.debian.org/debian/ bullseye main
deb-src http://deb.debian.org/debian/ bullseye-updates main
deb http://security.debian.org/debian-security bullseye-security main
deb-src http://security.debian.org/debian-security bullseye-security main
deb http://ftp.debian.org/debian bullseye-backports main
deb http://deb.debian.org/debian bookworm main contrib
deb http://deb.debian.org/debian bookworm-updates main contrib
deb http://security.debian.org bookworm-security main contrib
deutsche Spiegelserver: ftp2.de.debian.org/debian/, ftp.de.debian.org/debian/
gefunden auf: https://linuxnews.de/2021/07/debian-10-auf-11-wie-laeuft-das-upgrade/
