Hey, I got it working again. Not sure what it was.
I did delete dconf files under /root (sorry no backup) then dpkg-reconfigure gdm3 gnome-shell gnome-session and it is back to normal. No changes in /etc, I do not know about /var/lib though. Sorry, I still can not figure out what did cause the problem and where the error is/was. Cheers colliar
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