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When i am upgrade Ubuntu from 13.04 to 13.10 my gnome shell becomes this: screenshot What's wrong?

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This looks like the Gnome screensaver. –  Mitch Nov 9 '13 at 9:00
Realy?)))) Why he has squares? –  Andrey Vorobyev Nov 10 '13 at 6:38
Here is my screenshot, and when I click on it I get the box shown. –  Mitch Nov 10 '13 at 6:47
Yes, i am understand this. But why screensaver picture has low quality? –  Andrey Vorobyev Nov 10 '13 at 7:09

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