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[Launchpad Bug Tracker <1305006@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lightdm - 1.10.3-0ubuntu2

---------------
lightdm (1.10.3-0ubuntu2) trusty; urgency=medium

  * Refresh patches
 -- Robert Ancell <robert.ancell@xxxxxxxxxxxxx>   Fri, 10 Oct 2014 21:24:51 +1300

** Changed in: lightdm (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1305006

Title:
  Crashes running display server scripts for non X servers

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.10 series:
  Fix Released
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Trusty:
  Fix Released
Status in lightdm source package in Utopic:
  Fix Released

Bug description:
  [Impact]
  Running non X server setups (e.g. Unity 8) and having display server scripts configured leads to LightDM crashing. This is due to a faulty assumption in LightDM assuming all display servers are X servers. Commonly caused by having nVidia prime support installed. Error reports in [1].

  [Test Case]
  1. Install the Unity 8 desktop preview
  2. Configure a display setup script in the LightDM configuration:
   [SeatDefaults]
   display-setup-script=...
  3. Start LightDM
  4. Log in Unity 8
  Expected result:
  Setup script is run and you are logged into Unity 8
  Observed result:
  LightDM crashes

  [Regression Potential]
  Low, fix is simple. Tested with regression tests.

  [1]
  https://errors.ubuntu.com/bucket/?id=/usr/sbin/lightdm%3A11%3Ax_server_local_get_authority_file_path%3Aseat_xlocal_run_script%3Arun_script%3Adisplay_server_ready_cb%3A_g_closure_invoke_va

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