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Upgrade debian 10 to debian 11

Pre-Requisites

Backup the whole system!

Update System

sudo apt update && sudo apt upgrade

Replace Repo With Debian 11

cp /etc/apt/sources.list /etc/apt/sources.list.bak
cat << EOF >/etc/apt/sources.list
deb http://deb.debian.org/debian/ bullseye main contrib non-free
deb-src http://deb.debian.org/debian/ bullseye-updates main contrib non-free

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 contrib non-free
EOF

Upgrade the System to Debian 11

sudo apt update
sudo apt full-upgrade

Restart and Confirm OS Version

sudo reboot
cat /etc/os-release

Purge outdated package

sudo apt --purge autoremove