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[carlix <877066@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 871667 ***
    https://bugs.launchpad.net/bugs/871667

** Also affects: lightdm
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/877066

Title:
  Failed to start session (Error opening file
  '/var/lib/lightdm/.Xauthority': Permission denied)

Status in “lightdm” package in Ubuntu:
  Confirmed

Bug description:
  LightDM was working with Oneiric, but after some updates, it stopped
  working. Boot stops to checking battery state (I have a netbook). As a
  workaround, I can use either GDM or KDM. Content of file
  "/var/log/lightdm/lightdm.log" is:

  [+0.03s] DEBUG: Logging to /var/log/lightdm/lightdm.log
  [+0.03s] DEBUG: Starting Light Display Manager 1.0.1, UID=0 PID=1044
  [+0.03s] DEBUG: Loaded configuration from /etc/lightdm/lightdm.conf
  [+0.03s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
  [+0.03s] DEBUG: Registered seat module xlocal
  [+0.03s] DEBUG: Registered seat module xremote
  [+0.03s] DEBUG: Adding default seat
  [+0.03s] DEBUG: Starting seat
  [+0.03s] DEBUG: Starting new display for greeter
  [+0.03s] DEBUG: Starting local X display
  [+0.04s] DEBUG: X server :0 will replace Plymouth
  [+0.08s] DEBUG: Using VT 7
  [+0.08s] DEBUG: Activating VT 7
  [+0.08s] DEBUG: Logging to /var/log/lightdm/x-0.log
  [+0.09s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
  [+0.09s] DEBUG: Launching X Server
  [+0.09s] DEBUG: Launching process 1081: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
  [+0.09s] DEBUG: Waiting for ready signal from X server :0
  [+0.09s] DEBUG: Acquired bus name
  [+0.09s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
  [+4.62s] DEBUG: Got signal 10 from process 1081
  [+4.62s] DEBUG: Got signal from X server :0
  [+4.62s] DEBUG: Stopping Plymouth, X server is ready
  [+4.65s] DEBUG: Connecting to XServer :0
  [+4.66s] DEBUG: Starting greeter session
  [+5.43s] DEBUG: pam_start("lightdm-autologin", "lightdm") -> (0x82cff00, 0)
  [+5.44s] DEBUG: Starting session unity-greeter as user lightdm logging to /var/log/lightdm/x-0-greeter.log
  [+5.48s] DEBUG: pam_authenticate(0x82cff00, 0) -> 0 (Success)
  [+5.48s] DEBUG: pam_acct_mgmt(0x82cff00, 0) -> 0 (Success)
  [+5.48s] DEBUG: Launching session
  [+5.50s] DEBUG: pam_set_item(0x82cff00, 3, ":0") -> 0 (Success)
  [+5.61s] DEBUG: pam_open_session(0x82cff00, 0) -> 0 (Success)
  [+6.04s] DEBUG: Opened ConsoleKit session 193152f56cf0db270b0c38b70000000e-1318615057.380498-941759704
  [+6.04s] DEBUG: Dropping privileges to uid 107
  [+6.04s] DEBUG: Adding session authority to /var/lib/lightdm/.Xauthority
  [+6.04s] WARNING: Error reading existing Xauthority: Error opening file: Permission denied
  [+6.04s] DEBUG: Restoring privileges
  [+6.04s] WARNING: Failed to write authority: Error opening file '/var/lib/lightdm/.Xauthority': Permission denied
  [+6.04s] DEBUG: Failed to start greeter session
  [+6.04s] DEBUG: Stopping display
  [+6.04s] DEBUG: Sending signal 15 to process 1081
  [+6.36s] DEBUG: Process 1081 exited with return value 0
  [+6.36s] DEBUG: X server stopped
  [+6.36s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
  [+6.36s] DEBUG: Releasing VT 7
  [+6.36s] DEBUG: Display server stopped
  [+6.36s] DEBUG: Display stopped
  [+6.36s] DEBUG: Stopping X local seat, failed to start a display
  [+6.36s] DEBUG: Stopping seat
  [+6.36s] DEBUG: Seat stopped
  [+6.36s] DEBUG: Stopping lightdm, required seat has stopped
  [+6.36s] DEBUG: Stopping display manager
  [+6.36s] DEBUG: Display manager stopped
  [+6.36s] DEBUG: Stopping Light Display Manager

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: lightdm 1.0.1-0ubuntu6
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic i686
  ApportVersion: 1.23-0ubuntu3
  Architecture: i386
  Date: Tue Oct 18 00:18:29 2011
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  SourcePackage: lightdm
  UpgradeStatus: Upgraded to oneiric on 2011-08-23 (55 days ago)

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