I was trying to change this picture, and forget the name of the background.
Tried warty-final-ubuntu.png and warty-final-ubuntu.jpg but no use.
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It is called warty-final-ubuntu.png just like you said but if you are searching for it I don't think it will show up since it is in usr folder. It is in filesystem/usr/share/backgrounds Also I don't think you can change it as I can't put any other images in that folder or rename one in it already.