Description Jürn Brodersen 2021-12-01 21:49:49 CET

Created attachment 10869 [details]
apt debug output

ucs@school installation fails during replica join

There is some dependency issue that prevents apt from installing the "ucs-school-replica" package. As far as I can tell, the problem is the already enabled errata repository which includes an updated samba version. That results in dependencies on the updated packages and apt doesn't want to update all the packages.


Error:
"""
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 ucs-school-replica : Depends: univention-s4-connector (>= 6.0.128-24) but it is not going to be installed or
                               univention-samba-slave-pdc but it is not installable
E: Unable to correct problems, you have held broken packages.
"""

Workarounds:
- Update the system before joining.
- Just joining again after the error appeared seems to work as well.
- You could also comment out the errata repository in "/etc/apt/sources.list.d/15_ucs-online-version.list" before joining.

Some notes:
"apt install univention-s4-connector" -> works
"apt install ucs-school-replica" -> does not work
"apt install samba-dsdb-modules ucs-school-replica" -> works

So it is not impossible to break the dependency chain. "aptitude" is also able to install "ucs-school-replica".

Attached is the output from:
"apt-get -o Debug::pkgProblemResolver=yes -o Debug::pkgProblemResolver::ShowScores=yes -o Debug::pkgDepCache::Marker=yes -o Debug::pkgDepCache::AutoInstall=yes install ucs-school-replica"