What went wrong with nvidia at upgrade 8.04->8.10?

Asked by udippel

After an (otherwise) normal upgrade from 8.04 to 8.10, I have no more X. It simply showed a black screen without any chance for Ctrl-Alt-Del, only a hard reset would do. At recovery, the fix X option also ends me at the same black screen. At a root terminal, Xorg -configure does not produce a working xorg.conf. nvidia-xconfig funnily states I had a 177-glx, but a 96.43 kernel module. Which I never installed, by the way. The system has always been on 7050, and without problem. So it tries to load VGA, and that brings the black screen, I guess. My last resort, rm /etc/X11/xorg.conf and startx reproducably ends me with a frozen screen and a message OAFIID:GNOME_FastUserSwitchApplet
has died. And requires another hard reboot to get out. I read through many other NVIDIA problems at update 8.04 to 8.10, but have yet to find a solution for mine. No, I won't reinstall 8.04.
I am sure, it is a problem at packages and dependencies, it seems it has a lot of nvidia-stuff installed, and of all sorts, the very old 70-something, 96 and 177 here, that were never needed.

I will gladly furnish some further info, if it can help

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udippel (udippel) said :
#1

Okay, solved. The problem was that one way or another I was still booting to the 'old' kernel.
Should I write 'solved', because this is still something to be polished! Booting another kernel should not result in a bad crash as described. Ubuntu is already pretty good at guiding the user, and here some guidance might be there as well, instaed of the ordeal as mentioned above. A safety-net for non-starting X, so to say.

Uwe