I am experiencing the same bug with lightdm 1.2.1-0ubuntu1.
I can login with another user and with the guest user. Tried to purge lightdm 
and reinstall, but didn't work. Most likely there is some configuration filer 
in my home that cuase lightdm to crash. Workaround is to use gdm.
I am not posting logs as they look pretty much the same as the ones already 
posted

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https://bugs.launchpad.net/bugs/951404

Title:
  Ubuntu 12.04 session don't open with lightdm

Status in “lightdm” package in Ubuntu:
  Incomplete
Status in “lightdm” source package in Precise:
  Incomplete

Bug description:
  
  Ubuntu 12.04 Beta1

  lightdm 1.1.7-0ubuntu1

  After ugraded from Oneiric to Pangolin 12.04 beta1 the session don't
  open with lightdm, it autoclose and goes back to lightdm login screen.
  here are some log

  [+75.89s] DEBUG: Greeter start authentication for guy

  [+75.89s] DEBUG: Started session 4115 with service 'lightdm', username
  'guy'

  [+75.92s] DEBUG: Session 4115 got 1 message(s) from PAM

  [+75.92s] DEBUG: Prompt greeter with 1 message(s)

  [+101.80s] DEBUG: Continue authentication

  [+101.83s] DEBUG: Session 4115 authentication complete with return
  value 0: Success

  [+101.83s] DEBUG: Authenticate result for user guy: Success

  [+101.84s] DEBUG: User guy authorized

  [+101.84s] DEBUG: Greeter requests session gnome-classic

  [+101.84s] DEBUG: Using session gnome-classic

  [+101.84s] DEBUG: Stopping greeter

  [+101.84s] DEBUG: Session 4046: Sending SIGTERM

  [+101.93s] DEBUG: Session 4046 exited with return value 0

  [+101.93s] DEBUG: Greeter quit

  [+102.00s] DEBUG: Dropping privileges to uid 1000

  [+102.00s] DEBUG: Restoring privileges

  [+102.01s] DEBUG: Dropping privileges to uid 1000

  [+102.01s] DEBUG: Writing /home/guy/.dmrc

  [+102.04s] DEBUG: Restoring privileges

  [+102.08s] DEBUG: Starting session gnome-classic as user guy

  [+102.08s] DEBUG: Session 4115 running command /usr/sbin/lightdm-
  session gnome-session --session=gnome-classic

  [+102.12s] DEBUG: Registering session with bus path
  /org/freedesktop/DisplayManager/Session2

  [+102.12s] DEBUG: Greeter closed communication channel

  [+102.13s] DEBUG: Session 4115 exited with return value 1

  [+102.13s] DEBUG: User session quit

  [+102.13s] DEBUG: Stopping display

  [+102.13s] DEBUG: Sending signal 15 to process 4043

  [+102.22s] DEBUG: Process 4043 exited with return value 0

  [+102.22s] DEBUG: X server stopped

  [+102.22s] DEBUG: Removing X server authority /var/run/lightdm/root/:0

  [+102.22s] DEBUG: Releasing VT 7

  [+102.22s] DEBUG: Display server stopped

  [+102.22s] DEBUG: Display stopped

  [+102.22s] DEBUG: Active display stopped, switching to greeter

  [+102.22s] DEBUG: Switching to greeter

  [+102.22s] DEBUG: Starting new display for greeter

  [+102.22s] DEBUG: Starting local X display

  [+102.22s] DEBUG: Using VT 7

  [+102.22s] DEBUG: Logging to /var/log/lightdm/x-0.log

  [+102.22s] DEBUG: Writing X server authority to
  /var/run/lightdm/root/:0

  [+102.23s] DEBUG: Launching X Server

  [+102.23s] DEBUG: Launching process 5421: /usr/bin/X :0 -auth
  /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch

  [+102.23s] DEBUG: Waiting for ready signal from X server :0

  [+102.54s] DEBUG: Got signal 10 from process 5421

  [+102.54s] DEBUG: Got signal from X server :0

  [+102.54s] DEBUG: Connecting to XServer :0

  [+102.54s] DEBUG: Starting greeter

  [+102.54s] DEBUG: Started session 5424 with service 'lightdm',
  username 'lightdm'

  [+102.59s] DEBUG: Session 5424 authentication complete with return
  value 0: Success

  [+102.59s] DEBUG: Greeter authorized

  [+102.62s] DEBUG: Launching process 5436: /usr/bin/numlockx on

  [+102.62s] DEBUG: Process 5436 exited with return value 0

  [+102.62s] DEBUG: Exit status of /usr/bin/numlockx on: 0

  [+102.62s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log

  [+102.63s] DEBUG: Session 5424 running command /usr/lib/lightdm
  /lightdm-greeter-session /usr/sbin/unity-greeter

  [+102.90s] DEBUG: Greeter connected version=1.1.7

  [+102.90s] DEBUG: Greeter connected, display is ready

  [+102.90s] DEBUG: New display ready, switching to it

  [+102.90s] DEBUG: Activating VT 7

  [+102.90s] DEBUG: Stopping greeter display being switched from

  [+103.91s] DEBUG: Greeter start authentication for guy

  [+103.91s] DEBUG: Started session 5494 with service 'lightdm',
  username 'guy'

  [+103.93s] DEBUG: Session 5494 got 1 message(s) from PAM

  [+103.93s] DEBUG: Prompt greeter with 1 message(s)

  [+230.27s] DEBUG: Session 5424 exited with return value 9

  [+230.27s] DEBUG: Greeter quit

  [+230.27s] DEBUG: Failed to start greeter

  [+230.27s] DEBUG: Stopping display

  [+230.27s] DEBUG: Sending signal 15 to process 5421

  [+230.29s] DEBUG: Process 5421 exited with return value 0

  [+230.29s] DEBUG: X server stopped

  [+230.29s] DEBUG: Removing X server authority /var/run/lightdm/root/:0

  [+230.29s] DEBUG: Releasing VT 7

  [+230.29s] DEBUG: Display server stopped

  [+230.29s] DEBUG: Display stopped

  [+230.29s] DEBUG: Active display stopped, switching to greeter

  [+230.29s] DEBUG: Switching to greeter

  [+230.29s] DEBUG: Starting new display for greeter

  [+230.29s] DEBUG: Starting local X display

  [+230.29s] DEBUG: Using VT 7

  [+230.29s] DEBUG: Logging to /var/log/lightdm/x-0.log

  [+230.29s] DEBUG: Writing X server authority to
  /var/run/lightdm/root/:0

  [+230.29s] DEBUG: Launching X Server

  [+230.29s] DEBUG: Launching process 9103: /usr/bin/X :0 -auth
  /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch

  [+230.29s] DEBUG: Waiting for ready signal from X server :0

  [+230.62s] DEBUG: Got signal 10 from process 9103

  [+230.62s] DEBUG: Got signal from X server :0

  [+230.62s] DEBUG: Connecting to XServer :0

  [+230.62s] DEBUG: Starting greeter

  [+230.62s] DEBUG: Started session 9108 with service 'lightdm',
  username 'lightdm'

  [+230.62s] DEBUG: Greeter closed communication channel

  [+230.62s] DEBUG: Session 9108 exited with return value 1

  [+230.62s] DEBUG: Session 9108 failed during authentication

  [+230.62s] DEBUG: Greeter failed authentication

  [+230.62s] DEBUG: Greeter failed to start

  [+230.62s] DEBUG: Stopping display

  [+230.62s] DEBUG: Sending signal 15 to process 9103

  [+230.71s] DEBUG: Process 9103 exited with return value 0

  [+230.71s] DEBUG: X server stopped

  [+230.71s] DEBUG: Removing X server authority /var/run/lightdm/root/:0

  [+230.71s] DEBUG: Releasing VT 7

  [+230.71s] DEBUG: Display server stopped

  [+230.71s] DEBUG: Display stopped

  [+230.71s] DEBUG: Stopping X local seat, failed to start a display

  [+230.71s] DEBUG: Stopping seat

  [+230.71s] DEBUG: Seat stopped

  [+230.71s] DEBUG: Required seat has stopped

  [+230.71s] DEBUG: Stopping display manager

  [+230.71s] DEBUG: Display manager stopped

  [+230.71s] DEBUG: Stopping daemon

  [+230.71s] DEBUG: Exiting with return value 1

  If I use gdm I can open session after a freeze of almost 40 secondes
  with the totally pink picture.

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