If this is still a problem could you follow the instructions in https://wiki.ubuntu.com/DebuggingSystemCrash?
Thanks ** Changed in: Ubuntu Status: Unconfirmed => Needs Info -- cdrom0 works OK cdrom1 freezes Gnome/Ubuntu https://launchpad.net/bugs/32881 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs