Ok, so I did 1) ctrl+alt+F1 2) type in username + password 3) sudo reboot
and this is an error I found: [ 568.908068] BUG: soft lockup detected on CPU#0! [ 568.908068] Call Trace: <IRQ> (bunch of numbers) {softlockup_tick+250} My processor is an Intel Pentium D 805 processor, as well. -- Ubuntu cannot restart or shut-down https://launchpad.net/bugs/81236 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs