I have the identical problem with two computers running edgy and one with dapper. I have noticed a few other comments on the forums regarding the same issue. I have no idea about debugging so I hope you can resolve this issue.
-- Cupsys hangs on restart and stop-start https://launchpad.net/bugs/55295 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs