I installed Ubuntu x64 12.04 Desktop LTS on my new laptop three days ago.

Of course when I installed it I did an "apt-get upgrade" and a "apt-get update". I modified the .bashrc file to add some aliases but that's about it.

Everything went fine I think, but this morning when I tried to connect to my user account, it just simply didn't work.

Even when I give the right password, it will send me to a black screen with a few text lines written in white for a second and then back to the log-in screen.

When I logged into the guest session, I couldn't shutdown / restart.

I tried the "rm /home/MyUsername/.Xauthority" solution after doing a Ctrl + Alt + F1 at the log-in screen. But that didn't work.

Does anyone has an idea ? My Ubuntu seems to use Gnome.

Thank you a lot in advance !

This question is similar to this one, but their solution didn't help : --> after 12.04 upgrade: can't log in although password is correct