Thanks folks for the resolution on this and apologies, I wouldn't have submitted a bug report had I realised I was running a non-reference stack.
-- 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/1584635 Title: Black screen after logging in to Unity 8 [std::exception::what: Nested Mir Display Error: Failed to initialize EGL.: EGL_NOT_INITIALIZED (0x3001)] Status in Mir: Invalid Status in mir package in Ubuntu: Invalid Status in unity8 package in Ubuntu: Invalid Status in unity8-desktop-session package in Ubuntu: Invalid Bug description: I'm running 16.04 64-bit (upgraded from 15.10 which was upgraded from 15.04) and followed mhall's tutorial here http://mhall119.com/2016/05 /dogfooding-unity-8/ The error in the log was: Failed to initialize EGL I have a mobile AMD GPU with open source drivers: Gallium 0.4 on AMD RV620 Full unity 8 log here: http://paste.ubuntu.com/16581290/ The comment suggesting $ sudo sysctl restart lightdm fails with sysctl: cannot stat /proc/sys/restart: No such file or directory sysctl: cannot stat /proc/sys/lightdm: No such file or directory Switching TTYs and back again doesn't help. I still have a completely black screen. To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1584635/+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