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I'm so normal shell crashes gnome, I can only move the mouse and I can not do anything else. I have to resort to the blackout. Then turn on your computer appears to me that my system has a fault and apparently is in the xorg file.

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does it give you an error message!? please share it ;) – Dr_Bunsen Jun 9 '12 at 12:40
The error message is about the xorg file and has to do with insurance bumblebee because clearing the energy savings and enable the nvidia longer I get. – aceqott Jun 9 '12 at 12:42
its about, but what is it exactly?! Can't go fixing things without knowing whats broken. – Dr_Bunsen Jun 9 '12 at 12:54

Try re-installing the Gnome shell. Boot into a Unity session and run sudo apt-get purge gnome-shell. Beware that this also removes the Gnome tweak tool if you have that installed. Re-install the shell and everything should be back to working order.

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It happened to me also just when I've entered the keyboard settings and added a second keyboard layout. I haven't seen error messages on any virtual desktop. I have a radeon hd 3450 video card, with gallium3d driver (amd discontinued support for my card in linux).

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