I have a problem with Ubuntu 13.04, there is no wallpaper except a white one . I tried to change it but it didn't change.
closed as off topic by Eric Carvalho, Basharat Sialvi, Mateo, Luis Alvarado♦ Apr 19 '13 at 2:32
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Ubuntu 13.04 is currently still in development so this will likely be resolved once it releases. And it is policy not to answer to bugs in dev versions.
But to at least give you a hint, could you check if the 'backgrounds' folder is present and has pictures in it? To do this type