Upgrading Debian to the next major version
From Andreida
If you are doing this over the network (not on your desktop and not on a LOCAL virtual machine) you should consider to use "screen" for this process. In case you lose connection during the update/upgrade the process will continue and you can just reconnect to the server and then reconnect to the screen (screen -r).
The current screen has that nasty readme
11 -> 12 (bullseye -> bookworm
cat /etc/issue apt-get update apt-get upgrade apt-get dist-upgrade sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list apt-get update apt-get upgrade apt-get dist-upgrade apt-get -y autoremove shutdown -r now cat /etc/issue
or something shorter but with no control:
cat /etc/issue apt-get update && apt-get -y upgrade && apt-get -y dist-upgrade && apt-get -y autoremove sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list export DEBIAN_FRONTEND=noninteractive apt-get update && apt-get -y upgrade && apt-get -y dist-upgrade && apt-get -y autoremove shutdown -r now cat /etc/issue
10 -> 11 (buster -> bullseye)
cat /etc/issue apt-get update apt-get upgrade apt-get dist-upgrade sed -i 's/buster/bullseye/g' /etc/apt/sources.list sed -i 's/bullseye\/updates/bullseye-security/g' /etc/apt/sources.list apt-get update apt-get upgrade apt-get dist-upgrade apt-get -y autoremove shutdown -r now cat /etc/issue
or something shorter but with less control:
apt-get update && apt-get -y upgrade && apt-get -y dist-upgrade sed -i 's/buster/bullseye/g' /etc/apt/sources.list sed -i 's/bullseye\/updates/bullseye-security/g' /etc/apt/sources.list apt-get update && apt-get -y upgrade && apt-get -y dist-upgrade && apt-get -y autoremove shutdown -r now cat /etc/issue
9 -> 10 (stretch -> buster)
cat /etc/issue apt-get update apt-get upgrade apt-get dist-upgrade sed -i 's/stretch/buster/g' /etc/apt/sources.list apt-get update apt-get upgrade apt-get dist-upgrade apt-get -y autoremove shutdown -r now cat /etc/issue
8 -> 9 (jessie -> stretch)
cat /etc/issue apt-get update apt-get upgrade apt-get dist-upgrade sed -i 's/jessie/stretch/g' /etc/apt/sources.list apt-get update apt-get upgrade apt-get dist-upgrade apt-get -y autoremove shutdown -r now cat /etc/issue
