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-X, which is subscribed to xorg in 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 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp