The problem is probably XMir. Unfortunately we can't progress without a readable stack trace of the crash.
** Changed in: xmir Status: New => Incomplete ** Changed in: xorg (Ubuntu) Status: New => Incomplete -- 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/1231945 Title: [xmir] X seems to be dumping core on system shutdown To manage notifications about this bug go to: https://bugs.launchpad.net/xmir/+bug/1231945/+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