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When i start my computer i have this: strange desktop wallpaper After 2-3 seconds the menu loads, my normal wallpaper and all other, but why is this showing is it something to worry about and how to fix it?

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This is not a wallpaper, but the result of a minor graphics driver bug/incompatibility. You could try another driver if it is available for your graphics card and if you find it annoying (check software center > Edit > Software Sources, choose the Additional Drivers tab to see if there are other drivers available).

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