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[Sebastien Bacher <seb128@xxxxxxxxxx>]

Ok, your config doesn't show anything weird

"WARNING: Failed to open log file /var/log/lightdm/x-0-greeter.log:
Permission denied" is an issue happening for everybody it seems and
likely has to do with some of the privilege drops fixes from before
Oneiric, it's worth a new bug if nobody opened one yet but it's not what
is breaking your system

your lightdm.log has

"[+2.52s] DEBUG: Launching process 13148: /usr/lib/lightdm/lightdm-greeter-session 'unity-greeter'
[+2.52s] WARNING: Failed to open log file /var/log/lightdm/x-0-greeter.log: Permission denied
[+2.52s] DEBUG: pam_setcred(0x230e7e0, PAM_ESTABLISH_CRED) -> 0 (Success)
[+2.52s] DEBUG: PAM returns environment 'TH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games LANGUAGE=de_DE:en LC_MESSAGES=de_DE.UTF-8 LANG=de_DE.UTF-8'
[+2.54s] DEBUG: Process 13148 exited with return value 0"

Which is weird, notices that it starts at "TH=..."

on my log I get "DEBUG: PAM returns environment
'PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
LANG=fr_FR.UTF-8'"

so it seems somewhat you pam environment get mangled, that might be a
different issues from the ones on this bug, could you restart your box
in its current state and open a new bug using "ubuntu-bug lightdm", it
should attach your log infos etc

what do you have in /etc/environment?

The "TH=" is weird, it should b "PATH="...

-- 
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Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/804171

Title:
  After latest upgrade of oneiric, Lightdm or Xserver not working

Status in One Hundred Paper Cuts:
  New
Status in “lightdm” package in Ubuntu:
  Incomplete

Bug description:
  It seems that, after last upgrade of Oneiric made one hour ago, either Xserver or lightdm doesn't work anymore.
  Before the login screen Ubuntu prints out some state messages. The last one is "Checking battery state" (mine it is not a portable PC)
  I have to press Alt+F1, I logged in and wrote "startx". Gnome3 says "Failed to load session "gnome-fallback"" (my pc doesn't support neither Gnome-shell nor Unity3D) and pressing the only button Log Out terminal compares again.
  Is it possible to rollback last upgrade of Lightdm?

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