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I've upgraded Ubuntu 11.10 to 12.04 and after upgrade I see a broken LightDM login screen (strange dots around the screen). When changing login name, the screen's back to normal. How to fix that issue?

enter image description here

After upgrade to 12.10 login screen back to normal. Thanks anyway :)

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closed as too localized by fossfreedom Oct 21 '12 at 20:02

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Try to reinstall the lightDm. –  Ravi Jun 9 '12 at 9:56
I believe this is most likely a graphics driver issue. Lightdm doesn't have any GUI, so if you did want to reinstall something it should be unity-greeter. –  mfisch Oct 12 '12 at 4:23
I agree that it looks like a video driver issue. Did you recently get an update for your graphics driver? –  Githlar Oct 12 '12 at 4:56

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