Since I upgraded my computer to 12.04 from 11.04 nothing works anymore.
Intel® Core™2 Duo
NVIDIA graphics card
First I had Problems running the my old user (I guessed it had something to do wie ID and GID), so I just saved everything and deleted that account.
But still everything was running unstable and I figured out it must be because I had Win Vista also running on this computer, so giving Ubuntu another chance I reinstalled EVERYTHING, including deleting all partitions so Ubuntu would be the only OS.
And still everything was running horrible, like the system was very slow, the screen was having little blackouts like (I think all relating to the Graphics card?). I thought it might be because lightdm is unstable so I uninstalled it and put gdm on (I already used falback-session because of it's more convenient look).
It was running ok after that (not fast though, still screen problems, etc) but suddenly it started booting into the terminal. I tried running
startx and it seemed to load but then the system froze.
Now I'm running from the liveCD (which works totally fine!?).
I'm very desperate and I'd like to give Ubuntu a 5th (or something) chance but I won't work with a totally unstable system. Please help!