I have just installed 12.10. Problem is the screen keeps flashing. Maybe something to do with the video card? Very annoying as I can hardly see what I am typing here! Any ideas as to what I must do to correct this?
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Try booting into Recovery Mode. – Mitch Apr 23 '13 at 08:58
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I get that occasionally with my ATI card, I have to turn the computer off so the card totally resets. A reboot doesn't do it. – Meer Borg Apr 23 '13 at 09:13
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I've just spent many hours with Ubuntu 13.04 and video probs ... I found this handy tutorial (my card is Nvidia).

mikaere66
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I installed ubuntu 13.04 on a ThinkPad T43 . The screen started flashing on login. Changing the desktop background stopped it.

Ragnarok
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