A common parody of the Ubuntu logo images and wallpapers, particularly the topless ones Ubuntu used in the early days. No idea of the source image. The poster asserts that the use of the old Ubuntu logo is fair use under US law for purposes of political and satirical commentary.
I love the photo… can you up a high-res photo? i want it as my background/login screen
I found it on the web looking for “ubuntu bums” or “ubuntu arses”. Search Google Images with SafeSearch off and you should find it readily enough. Warning: I’ve edited the photo slightly to make it not technically obscene, the versions on the web are generally unedited. And I have no idea where the original image is from.