This problem has been solve by booting up with --debug option after linux line once, and now it works even without --debug option.
-- main process ended when booting up https://bugs.launchpad.net/bugs/537549 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
