Upgrade Debian 10 Buster to Debian 11 Bullseye

Backup


Backup your System or at least your data.

Update


apt update
apt -y upgrade

Repository


cat << EOF > "${BASE}/etc/apt/sources.list"
deb http://ftp.debian.org/debian/ bullseye main
deb-src http://ftp.debian.org/debian/ bullseye main

deb http://deb.debian.org/debian-security/ bullseye-security main
deb-src http://deb.debian.org/debian-security/ bullseye-security main

deb http://ftp.debian.org/debian/ bullseye-updates main
deb-src http://ftp.debian.org/debian/ bullseye-updates main
EOF

Upgrade


apt update
apt -y upgrade
apt -y full-upgrade
apt -y autoremove

Reboot


reboot

==Verify ==
uname -r
5.10.0-8-amd64

cat /etc/debian_version
11.0

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