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how can i fix the problem with the image?

If you look at the top-left of:


Text and some images starts flickering.

I have 2 Nvidia GTX460. Drivers are "unknown" according to "About this computer" at the top right. I've just installed ubuntu 12.10.

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likely a video card issue. Please edit your question to include information about your video card hardware and drivers. – ImaginaryRobots Nov 27 '12 at 20:30
Alright, so i have done that, where can i check what drivers i have? – xerimel Nov 27 '12 at 21:03

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