lightdm fails to restart via 'service' command when running mir

[Kevin Hunter]

Setup: Exactly the same as Bug #1217687 "[mir] [multimonitor] mouse choppy, typing text in terminal slow".

Attempting to execute '$ sudo service lightdm restart' from _either_ a tty (C-A-F1) or gnome-terminal from within a Mir session, lightdm is not able to start again. The screen stays blank/black.

  - Changing to tty1 (C-A-F1), and looking at lightdm.log, it appears that lightdm successfully stops, but there is no attempt to start a new session.

  - Looking at unity-system-compositor, there is a "Permission denied" error. (See attached)

To get back, it seems necessary to kill the compository:

    $ sudo killall unity-system-compositor
    $ sudo lightdm start

Lightdm now starts and I'm appropriately presented with the standard Unity interface.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu Package testing tracker.

A list of all reports related to this bug can be found here:
http://packages.qa.ubuntu.com/qatracker/reports/bugs/1217698

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1217262, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.