When installing the Eee, I had to deselect a ton of packages to make it fit on the tiny 4gb of flash. It's possible I deselected something that was an implied dependancy of firstboot. If that's the case, it probably needs a requires: After clicking OK, firstboot continues, and shows me the awesome 'New Firstboot' graphics.
Created attachment 299409 [details] screenshot
Yeah, looks like it just needs Requires: libuser-python