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After first viewing Compiz Cube Ubuntus graphics driver crashs and after that I turned the power of and restarted it but now there is a blackscreen after grub loader.

It still works with Windows or older kernel versions with Vesa drivers.

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Sounds to me like a graphics driver issue. I had this issue before and worked around it, removing the graphics driver in recovery on start up.

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Thank you reinstalling the graphics driver is a good idea. but how did you do it exactly You can start up in Graphics recovery mode but the usual drivers aren't released and you can't change the settings there. I could have used a beta graphics driver who is uncompatible with Compiz fusion cube –  Martin Erhardt Oct 28 '12 at 8:20
    
shall I do it over command line –  Martin Erhardt Oct 28 '12 at 8:46
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