Reminder Upgrade Debian 10 (Buster) to Debian 11 (Bullseye)

A simple reminder to upgrade  Debian 10 (Buster)  to Debian 11 (Bullseye) 

• apt update & apt upgrade
• Change source list :

vi /etc/apt/sources.list

deb http://deb.debian.org/debian bullseye main contrib non-free
deb-src http://deb.debian.org/debian bullseye main contrib non-free
deb http://deb.debian.org/debian-security/ bullseye-security main contrib non-free
deb-src http://deb.debian.org/debian-security/ bullseye-security main contrib non-free
deb http://deb.debian.org/debian bullseye-updates main contrib non-free
deb-src http://deb.debian.org/debian bullseye-updates main contrib non-free

Note : comment other source like Docker.

• apt update
• apt upgrade --without-new-pkgs
• apt full-upgrade
• cat /etc/debian_version

@todo : postgresql migration