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Possible Duplicate:
How do I change the wallpaper in LightDM?

I changed my login wallpaper to an image,which is different from my desktop background,using Ubuntu Tweak. When I logout/restart, it briefly displays the changed background, but fades to the old desktop background.

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marked as duplicate by Christopher Kyle Horton, Anwar Shah, Mitch, stephenmyall, jokerdino Sep 12 '12 at 13:24

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Can you be more explicit please ? – air-dex Sep 11 '12 at 22:31

I believe the answer you're looking for is here.

After you follow the steps, do the Ubuntu Tweak thing.

I believe Ubuntu Tweak is not working correctly because of the Dynamic Background that the Unity Greeter has. If you try this let us know the result. Have a good day.

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If I guess what you meant, it could be a problem about the owner of the file. It should be root instead of you.

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