Comment 6 for bug 1046206

Is your background called any one of these things?

           with open('/proc/cmdline', 'r') as fp:
                for background in (
                    '/usr/share/backgrounds/edubuntu_default.png',
                    '/usr/share/xfce4/backdrops/macinnis_wallpaper.png',
                    '/usr/share/xfce4/backdrops/xubuntu-precise-right.png',
                    '/usr/share/backgrounds/warty-final-ubuntu.png'):
                    exists = os.access(background, os.R_OK)
                    if (exists and not 'access=v1' in fp.readline()):
                        extras.append(subprocess.Popen(
                            ['/usr/lib/ubiquity/wallpaper', background],
                            stdin=null, stdout=logfile, stderr=logfile,
                            preexec_fn=self.drop_privileges))