It all starts with a blak-out at home, and at the restart, at the entrance
 to lightdm after about 5 seconds give me error-graphics-card 
and go with ctrl-alt-f1 in shell. After several attempts, reboot in safe mode and I start with "restores boot" and arrival in safe graphics mode. 
I state that I had the hysteresis converted into a gnome Ubuntu-Ubuntu. 
Between attempts , I saw fit to also uninstall GVFS and I can not reinstall it, 
it gives me the error packets. In summary, I can only access in graphical mode
 in safe mode and I disappeared gnome :-)

Sorry for my no good English