Interesting. Here's the unity8.log from one machine when it's working and (randomly) not working. This might help us narrow down the point of failure:
WORKING: qtmir.mir: MirServer created qtmir.mir: Command line arguments passed to Qt: ("unity8") [2016-06-07 09:39:06.463750] mirserver: Starting [2016-06-07 09:39:06.472754] mirserver: Using nested cursor [2016-06-07 09:39:06.508085] mirserver: Initial display configuration: [2016-06-07 09:39:06.518572] mirserver: 0.31: LVDS 12.7" 280x160mm [2016-06-07 09:39:06.518613] mirserver: Current mode 1366x768 60.01Hz [2016-06-07 09:39:06.518661] mirserver: Preferred mode 1366x768 60.01Hz [2016-06-07 09:39:06.518803] mirserver: Logical position +0+0 NOT WORKING: qtmir.mir: MirServer created qtmir.mir: Command line arguments passed to Qt: ("unity8") [2016-06-07 09:13:14.327471] mirserver: Starting [2016-06-07 09:13:14.337275] mirserver: Using nested cursor ERROR: QMirServer - Mir failed to start -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1537389 Title: Unity8 never loads and just stays on a black screen [unity8.log: ERROR: QMirServer - Mir failed to start] To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1537389/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs