In the progress of trying to fix this issue: viewtopic.php?f=217&t=101434
I installed the nvidia properitary drivers like this:
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sudo apt-get install nvidia-glx nvidia-xconfig
and afterwards ran nvidia-xconfig to generate an xorg.conf file (I had none before)
But now I cannot start a new cinnamon session anymore, mate, gnome and gnome-classic work without a problem, but cinnamon just flickers a bit and then shows an very uninformative errorwindow that states in german that there was a problem that could not be solved, and then I get back to the login screen.