I had Xubuntu 12.10 running for a month or so without major problems. A few days ago after downgrad firefox from 29 to 28 by removing and reinstalling and upgrading system , the system blacked out and can't get into GUI ever again. The symptoms are:
log in screen fine, after logged in, a black screen with a white cursor stopped in the middle the screen, unmovable, everything stucked here.
I had tried to log in to tty1, and here I tried a few things:
startx, a small error window pops out saying "failed to load session "gnome"", and an button "log out", I clicked it and was brought back to tty1 seeing a lot of messages(*1)
lspci | -i VGA, it gives "00.02 0 VGA compatible ....Intel..integrated....." which is my integraded intel graphic card.
sudo apt-get --purge remove nivdia*, it gives 0 installed package to remove. so nothing to remove here.
try to check file /etc/X11/xorg.conf, but no such file, instead there are several named a little bit different like xorg.conf.d*....
I send a copy of /var/log/Xorg.0.log to my email and it is attached here http://paste.ubuntu.com/7403846/