It was Ubuntu Desktop karmic alpha6. Here are the bug report files (from after the installation).
** Attachment added: "bug_report_files_sl500.tar.gz" http://launchpadlibrarian.net/32143436/bug_report_files_sl500.tar.gz -- Pressing restart in only-ubiquity mode throws an endless loop of respawning gdm/ubiquity https://bugs.launchpad.net/bugs/432140 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
