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
- Start by making sure the current system is up-to-date:
apt update apt full-upgrade
- Cleanup the package cache:
Make sure you have enough disk space. On both /usr and /var about 5 GiB free space will be needed temporarily. See the related manual chapter for more information.
- Prepare and start the upgrade to Bullseye:
sed -i 's/buster/bullseye/g' /etc/apt/sources.list export LC_ALL=C # optional (to get English output) apt update apt full-upgrade
apt-list-changes: be prepared for a lot of NEWS to read; press <return> to scroll down, <q> to leave the pager. All information will be mailed to root so that you can read it again (using mailx or mutt).
- Read all debconf information carefully, choose 'keep your currently-installed version' unless stated differently below; in most cases hitting return will be fine.
- restart services: Choose yes.
- Apply and adjust configuration:
cf-agent -I -D installation
- Get the new Debian Edu Bullseye artwork:
apt install debian-edu-artwork-bullseye
- After reboot, do some more cleanup:
apt purge linux-image-4.19.0-* apt purge linux-headers-4.19.0-* apt --purge autoremove
- Check if the upgraded system works:
Reboot; log in as first user and test
- if the GOsa² gui is working,
- if one is able to connect LTSP clients and workstations,
- if one can add/remove a netgroup membership of a system,
- if one can send and receive internal email,
- if one can manage printers,
- and if other site specific things are working.
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.