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[Sebastien Bacher <seb128@xxxxxxxxxx>]

seems like your issue is rather with the nvidia driver than lightdm...

** Package changed: lightdm (Ubuntu) => nvidia-graphics-drivers (Ubuntu)

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https://bugs.launchpad.net/bugs/918321

Title:
  lightdm frequently fails to start

Status in “nvidia-graphics-drivers” package in Ubuntu:
  New

Bug description:
  Most times (but not always) I start up Ubuntu lightdm fails to start,
  hitting ctrl+alt+f1 and starting it manually (sude service lightdm
  start) works. the lighdm log give me:

  [+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
  [+0.00s] DEBUG: Starting Light Display Manager 1.0.6, UID=0 PID=1259
  [+0.00s] DEBUG: Loaded configuration from /etc/lightdm/lightdm.conf
  [+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
  [+0.00s] DEBUG: Registered seat module xlocal
  [+0.00s] DEBUG: Registered seat module xremote
  [+0.00s] DEBUG: Adding default seat
  [+0.00s] DEBUG: Starting seat
  [+0.00s] DEBUG: Starting new display for greeter
  [+0.00s] DEBUG: Starting local X display
  [+0.01s] DEBUG: X server :0 will replace Plymouth
  [+0.03s] DEBUG: Using VT 7
  [+0.03s] DEBUG: Activating VT 7
  [+0.03s] DEBUG: Logging to /var/log/lightdm/x-0.log
  [+0.03s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
  [+0.03s] DEBUG: Launching X Server
  [+0.03s] DEBUG: Launching process 1303: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
  [+0.03s] DEBUG: Waiting for ready signal from X server :0
  [+0.03s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
  [+0.03s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
  [+0.19s] DEBUG: Process 1303 exited with return value 1
  [+0.19s] DEBUG: X server stopped
  [+0.19s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
  [+0.19s] DEBUG: Releasing VT 7
  [+0.19s] DEBUG: Stopping Plymouth, X server failed to start
  [+0.22s] DEBUG: Display server stopped
  [+0.22s] DEBUG: Stopping display
  [+0.22s] DEBUG: Display stopped
  [+0.22s] DEBUG: Stopping X local seat, failed to start a display
  [+0.22s] DEBUG: Stopping seat
  [+0.22s] DEBUG: Seat stopped
  [+0.22s] DEBUG: Stopping lightdm, required seat has stopped
  [+0.22s] DEBUG: Stopping display manager
  [+0.22s] DEBUG: Display manager stopped
  [+0.22s] DEBUG: Stopping Light Display Manager

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