Found a duplicate bug and also my xenial laptop experiencing the same failure regularly...
unity8.log: () qtmir.screens: ScreenController::ScreenController [2016-06-07 09:13:14.320014] mirplatform: Found graphics driver: mir:mesa-x11 (version 0.21.0) [2016-06-07 09:13:14.320952] mirplatform: Found graphics driver: mir:mesa-kms (version 0.21.0) 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 I have unity-system-compositor and unity8-dash running fine. Only unity8 is missing. ** Summary changed: - The Desktop Never Loads and just stays on a black screen + Unity8 never loads and just stays on a black screen [unity8.log: ERROR: QMirServer - Mir failed to start] ** Changed in: mir Status: Incomplete => Confirmed ** Changed in: mir (Ubuntu) Status: Incomplete => Confirmed ** Changed in: unity8 (Ubuntu) Status: Incomplete => Confirmed ** Changed in: unity8-desktop-session (Ubuntu) Status: Incomplete => Confirmed ** Changed in: mir Milestone: None => 0.24.0 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to mir in 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] Status in Mir: Confirmed Status in mir package in Ubuntu: Confirmed Status in unity8 package in Ubuntu: Confirmed Status in unity8-desktop-session package in Ubuntu: Confirmed Bug description: The cursor is also not shown, neither is the Unity 8 Lock Screen or Indicators. Ubuntu 16.04 Daily ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: unity8-desktop-session-mir 1.0.12+15.10.20150609-0ubuntu1 ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3 Uname: Linux 4.3.0-7-generic x86_64 ApportVersion: 2.19.3-0ubuntu3 Architecture: amd64 CurrentDesktop: Unity Date: Sat Jan 23 18:44:45 2016 InstallationDate: Installed on 2016-01-22 (0 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160122.2) PackageArchitecture: all SourcePackage: unity8-desktop-session UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1537389/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp