In the fall of 2004, right before the release of Ubuntu 4.10 (Warty), a huge debate happened about the proposed artwork for that version of Ubuntu. Ubuntu Traffic #8 has more details about this. By the end of the debate, at the time of Warty’s release, the controversial GDM login screen, Gnome splash screen, and the “naked people” desktop backgrounds were all gone from a default Ubuntu installation. But the later were still available in Warty if you installed the “ubuntu-calendar” package.