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This page gives the directions on how to upgrade your Debian distribution

How to release upgrade your distribution

Upgrading from one stable release to the next (e.g. buster to bullseye) is done by following the release notes for your architecture. For most people with 32 bit systems that means the Release Notes for Intel x86. For most with 64 bit systems that means the Release Notes for AMD64.

Minor upgrades are done with the package management tool apt-get or apt, generally involves the following steps.

$ sudo apt clean
$ sudo apt update
$ sudo apt upgrade       # For regular upgrades
$ sudo apt dist-upgrade  # For release upgrades only
$ sudo apt autoremove
$ /sbin/shutdown -r now  # Reboot to make changes effective (optional)

Now check  uname -a  and you should see info about the upgraded system.