/!\ Before reading this upgrade guide, please note that live updates to your production servers are carried out at your own risk. Debian Edu/Skolelinux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law.

Please read this chapter and the New features in Bullseye chapter of this manual completely before attempting to upgrade.

General notes on upgrading

Upgrading Debian from one distribution to the next is generally rather easy. For Debian Edu this is unfortunately not yet true as we modify configuration files in ways we shouldn't. (See Debian bug 311188 for more information.) Upgrading is still possible but may require some work.

In general, upgrading the servers is more difficult than the workstations and the main-server is the most difficult to upgrade.

If you want to be sure that after the upgrade everything works as before, you should test the upgrade on a test system or systems configured the same way as your production machines. There you can test the upgrade without risk and see if everything works as it should.

Make sure to also read the information about the current Debian Stable release in its installation manual.

It may also be wise to wait a bit and keep running Oldstable for a few weeks longer, so that others can test the upgrade and document any problems they experience. The Oldstable release of Debian Edu will receive continued support for some time after the next Stable release, but when Debian ceases support for Oldstable, Debian Edu will necessarily do the same.

Upgrades from Debian Edu Buster

/!\ Be prepared: make sure you have tested the upgrade from Buster in a test environment or have backups ready to be able to go back.

Please note that the following recipe applies to a default Debian Edu main server installation (desktop=xfce, profiles Main Server, Workstation, LTSP Server). (For a general overview concerning Buster to Bullseye upgrade, see: https://www.debian.org/releases/bullseye/releasenotes)

Don't use X, use a virtual console, log in as root.

If apt finishes with an error, try to fix it and/or run apt -f install and then apt -y full-upgrade once again.

Upgrading the main server

apt update
apt full-upgrade

apt clean

sed -i 's/buster/bullseye/g' /etc/apt/sources.list
export LC_ALL=C        # optional (to get English output)
apt update
apt full-upgrade

cf-agent -I -D installation

apt install debian-edu-artwork-bullseye

apt purge linux-image-4.19.0-*
apt purge linux-headers-4.19.0-*
apt --purge autoremove

Reboot; log in as first user and test

Upgrading a workstation

Do all the basic things like on the main-server and without doing the things not needed.

Upgrades from older Debian Edu / Skolelinux installations (before Buster)

To upgrade from any older release, you will need to upgrade to the Buster based Debian Edu release first, before you can follow the instructions provided above. Instructions are given in the Manual for Debian Edu Buster about how to upgrade to Buster from the previous release, Stretch. Likewise the Stretch manual describes how to upgrade from Jessie.