I found the issue. It was mainly me, but i think something is still missing.
As I was updating from early ubuntu GNOME, the ubuntu-desktop metapackage
wasn't installed, causing the ubuntu session to silently fail.
I think that ubuntu-session should depend on ubuntu-desktop.
** Summary changed:
-
Added gdm log
** Attachment added: "gdm log file"
https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/1711388/+attachment/4934380/+files/gdmlog
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