mod for upgrade debian
$ sudo apt-get update $ sudo apt-get upgrade $ sudo apt-get full-upgrade
In a text editor, replace the codename of your release with that of the next release in APT's package sources
deb https://deb.debian.org/debian/ buster main
deb https://deb.debian.org/debian/ bullseye main
$ sudo nano /etc/apt/sources.list /etc/apt/sources.list.d/*
deb https://deb.debian.org/debian/ bookworm main contrib non-free non-free-firmware
deb https://deb.debian.org/debian/ stable main contrib non-free non-free-firmware
$ sudo apt-get clean $ sudo apt-get update
Interrupting this step after downloading has completed is an excellent way to stress-test your backups
$ sudo apt-get upgrade $ sudo apt-get full-upgrade
$ sudo apt-get autoremove
$ sudo shutdown -r now