Because of the broken dependencies, I could not upgrade any ubuntu packages.
Therefore, I upgraded all packages, including the mesa ones and I installed
kernel 6.5.0-1014-oem. The bug was back (white screen "something went wrong"
before reaching gdm). I removed all i386 mesa related packages
After forcing a downgrade of all packages that were updated last monday
to the version 23.0.4-0ubuntu1~22.04.1 (using binaries downloaded there:
https://bugs.launchpad.net/ubuntu/+source/mesa/23.0.4-0ubuntu1~22.04.1/+build/26344054),
the system works again using the nouveau driver. However, it
there is a mention of a similar issue there
https://askubuntu.com/questions/1504501/libgl-error-dri-driver-not-from-
this-mesa-build-23-0-4-0ubuntu122-04-1-vs
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I removed postgresql-10-pgrouting, still failed, then I removed
postgresql-12-postgis-2.4 and then postgresql-12-postgis-2.5 and it
finally worked
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https://bugs.launchpad.net/bugs/1883352
Public bug reported:
When trying to upgrade from 18.04 to 20.04, I get the following error
"Impossible d'évaluer la mise à niveau
Un problème insoluble est survenu lors du calcul de la mise à niveau.
Cela a probablement été causé par :
* des paquets logiciels non officiels qui ne proviennent
