I removed the nvidia proprietary drivers and tested again with the Nouveau drivers. This lead to almost the same result: black screen, although with responsive mouse cursor, can't access console, can't login to previously logged users, however X could be restarted (CtrlAltBackspace was previously enabled).
I removed the nvidia proprietary drivers and tested again with the Nouveau drivers. This lead to almost the same result: black screen, although with responsive mouse cursor, can't access console, can't login to previously logged users, however X could be restarted (CtrlAltBackspace was previously enabled).