> To solve the problem I had to revert back to glx-diversions 0.5.1. > But in order to do so, it _seemed_ that I also had to downgrade the nvidia- > driver package(s). I may have been wrong about that because I was working in a > (to me) limited console, whereas I normally do it in Konsole where I can see > much more and can (easily) scroll back to see all the output. > Indeed, reverting glx-diversions 0.5.1 requires reverting nvidia-... to 340.93-1 and solves the problem. However, reverting nvidia-... to 340.93-1 but keeping glx-diversions to 0.6.0 does not solve it – which gives some evidence that glx-diversions 0.6.0 is the culprit.
You can try to kill gdm from a root text console and launch X through the startx command from your user text console : then gdm should start without crashing. It thus seems that this is in the very first stages of gdm launching that the issue arises. Hoping this helps ; i can't find other interesting log files than syslog and messages, tell me if i should look another one. Best, Ara