I had a problem similar with optiplex 745, but i solved when modify /boot/grub/menu.lst
# defoptions=quiet splash for this # defoptions=quiet splash reboot=b Maybe help you. -- system hangs at shutdown https://bugs.launchpad.net/bugs/138691 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