Hamish Birchall, I'll close the report given you found this to be due to a faulty HDD.
** Changed in: xorg (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1743165 Title: Boot up sometimes doesn't work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1743165/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs