Comment 4 for bug 381901

Hmm, thats interesting.

You could do the same again and try the command "startx" (sans quotes), but i doubt it will help, and I don't expect you to try it.

Could you boot normally with a USB memory stick inserted, when the black screen shows, press Ctrl+Alt+F6. It should give you a command line (if it doesn't then don't worry and post back here saying so).

At the command line, log in, and then run this command:
sudo cp ~/.xsession-errors /media/<name-of-usb>

Note the "sudo" at the beginning, as well at the space between "cp" and "~", and the space between "s" and "/".
Replace "<name-of-usb>" with the name of your usb, i.e. the name that appears in My Computer when you are in windows, if it has spaces then I THINK you should type "name%20of%20usb" instead of "name of usb" but im not entirely sure.

After you run that command it should ask you for your sudo password (likely to be the same password as your user account if you dont know it). After you hit enter it will copper the error log onto your USB. :)