[ubuntu-art] Licensing on Desktop Backgrounds?

[Justin]

I'm designing a website for a client and she particularly likes the "Dawn of
Ubuntu" wallpaper that I happened to have on my computer when she was here.
She wants to use it as the background for her website, and I figure that
since it's in Ubuntu, it must be free. But what license is it released
under? I plan on putting a note in the footer crediting Ubuntu with a link,
but would that be sufficient?

Thanks for your help.
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