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After installing recommended updates and rebooting, I am stuck on the Login Screen. After entering my password, the screen goes black, and then I am returned to the Login Screen. I can login from the console using CTRL+ALT+F1.

My .xsession-errors contains:

No protocol specified
xhost: unable to open display ":0"
bind: Permission denied

Here is the output of /var/log/lightdm/lightdm.log:

[+0.04s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.04s] DEBUG: Starting Light Display Manager 1.2.1, UID=0 PID=1309
[+0.04s] DEBUG: Loaded configuration from /etc/lightdm/lightdm.conf
[+0.04s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.14s] DEBUG: Registered seat module xlocal
[+0.14s] DEBUG: Registered seat module xremote
[+0.14s] DEBUG: Adding default seat
[+0.14s] DEBUG: Starting seat
[+0.14s] DEBUG: Starting new display for greeter
[+0.14s] DEBUG: Starting local X display
[+0.15s] DEBUG: X server :0 will replace Plymouth
[+0.17s] DEBUG: Using VT 7
[+0.17s] DEBUG: Activating VT 7
[+0.17s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+1.08s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+1.08s] DEBUG: Launching X Server
[+1.08s] DEBUG: Launching process 1345: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
[+1.08s] DEBUG: Waiting for ready signal from X server :0
[+1.08s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+1.08s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+5.47s] DEBUG: Got signal 10 from process 1345
[+5.47s] DEBUG: Got signal from X server :0
[+5.47s] DEBUG: Stopping Plymouth, X server is ready
[+5.49s] DEBUG: Connecting to XServer :0
[+5.50s] DEBUG: Starting greeter
[+5.50s] DEBUG: Started session 1409 with service 'lightdm', username 'lightdm'
[+6.28s] DEBUG: Session 1409 authentication complete with return value 0: Success
[+6.28s] DEBUG: Greeter authorized
[+6.28s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log
[+6.45s] DEBUG: Session 1409 running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
[+9.82s] DEBUG: Greeter connected version=1.2.1
[+9.82s] DEBUG: Greeter connected, display is ready
[+9.82s] DEBUG: New display ready, switching to it
[+9.82s] DEBUG: Activating VT 7
[+13.60s] DEBUG: Greeter start authentication for jim
[+13.60s] DEBUG: Started session 1806 with service 'lightdm', username 'jim'
[+13.68s] DEBUG: Session 1806 got 1 message(s) from PAM
[+13.68s] DEBUG: Prompt greeter with 1 message(s)
[+18.46s] DEBUG: Continue authentication
[+21.15s] DEBUG: Session 1806 authentication complete with return value 7: Authentication failure
[+21.15s] DEBUG: Authenticate result for user jim: Authentication failure
[+21.15s] DEBUG: Greeter start authentication for jim
[+21.15s] DEBUG: Session 1806: Sending SIGTERM
[+21.15s] DEBUG: Started session 2047 with service 'lightdm', username 'jim'
[+21.17s] DEBUG: Session 2047 got 1 message(s) from PAM
[+21.17s] DEBUG: Prompt greeter with 1 message(s)
[+30.73s] DEBUG: Continue authentication
[+34.08s] DEBUG: Session 2047 authentication complete with return value 0: Success
[+34.08s] DEBUG: Authenticate result for user jim: Success
[+34.12s] DEBUG: User jim authorized
[+34.14s] DEBUG: Greeter requests session ubuntu
[+34.14s] DEBUG: Using session ubuntu
[+34.14s] DEBUG: Stopping greeter
[+34.14s] DEBUG: Session 1409: Sending SIGTERM
[+34.25s] DEBUG: Session 1409 exited with return value 0
[+34.25s] DEBUG: Greeter quit
[+34.30s] DEBUG: Dropping privileges to uid 1000
[+34.30s] DEBUG: Restoring privileges
[+34.36s] DEBUG: Dropping privileges to uid 1000
[+34.36s] DEBUG: Writing /home/jim/.dmrc
[+34.36s] DEBUG: Restoring privileges
[+34.46s] DEBUG: Starting session ubuntu as user jim
[+34.46s] DEBUG: Session 2047 running command /usr/sbin/lightdm-session gnome-session --session=ubuntu
[+34.60s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session0
[+34.60s] DEBUG: Greeter closed communication channel
[+35.36s] DEBUG: Session 2047 exited with return value 1
[+35.36s] DEBUG: User session quit
[+35.36s] DEBUG: Stopping display
[+35.36s] DEBUG: Sending signal 15 to process 1345
[+35.63s] DEBUG: Process 1345 exited with return value 0
[+35.63s] DEBUG: X server stopped
[+35.63s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
[+35.63s] DEBUG: Releasing VT 7
[+35.63s] DEBUG: Display server stopped
[+35.63s] DEBUG: Display stopped
[+35.63s] DEBUG: Active display stopped, switching to greeter
[+35.63s] DEBUG: Switching to greeter
[+35.63s] DEBUG: Starting new display for greeter
[+35.63s] DEBUG: Starting local X display
[+35.63s] DEBUG: Using VT 7
[+35.63s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+35.63s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+35.63s] DEBUG: Launching X Server
[+35.63s] DEBUG: Launching process 2185: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+35.63s] DEBUG: Waiting for ready signal from X server :0
[+35.98s] DEBUG: Got signal 10 from process 2185
[+35.98s] DEBUG: Got signal from X server :0
[+35.98s] DEBUG: Connecting to XServer :0
[+35.98s] DEBUG: Starting greeter
[+35.98s] DEBUG: Started session 2190 with service 'lightdm', username 'lightdm'
[+36.04s] DEBUG: Session 2190 authentication complete with return value 0: Success
[+36.05s] DEBUG: Greeter authorized
[+36.05s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log
[+36.05s] DEBUG: Session 2190 running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
[+36.57s] DEBUG: Greeter connected version=1.2.1
[+36.57s] DEBUG: Greeter connected, display is ready
[+36.57s] DEBUG: New display ready, switching to it
[+36.57s] DEBUG: Activating VT 7
[+36.57s] DEBUG: Stopping greeter display being switched from
[+37.56s] DEBUG: Greeter start authentication for jim
[+37.56s] DEBUG: Started session 2278 with service 'lightdm', username 'jim'
[+37.59s] DEBUG: Session 2278 got 1 message(s) from PAM
[+37.59s] DEBUG: Prompt greeter with 1 message(s)
[+13520.98s] DEBUG: Continue authentication
[+13523.32s] DEBUG: Session 2278 authentication complete with return value 0: Success
[+13523.32s] DEBUG: Authenticate result for user jim: Success
[+13523.34s] DEBUG: User jim authorized
[+13523.39s] DEBUG: Greeter requests session ubuntu
[+13523.39s] DEBUG: Using session ubuntu
[+13523.39s] DEBUG: Stopping greeter
[+13523.39s] DEBUG: Session 2190: Sending SIGTERM
[+13523.60s] DEBUG: Greeter closed communication channel
[+13523.60s] DEBUG: Session 2190 exited with return value 0
[+13523.60s] DEBUG: Greeter quit
[+13523.63s] DEBUG: Dropping privileges to uid 1000
[+13523.63s] DEBUG: Restoring privileges
[+13523.67s] DEBUG: Dropping privileges to uid 1000
[+13523.67s] DEBUG: Writing /home/jim/.dmrc
[+13523.67s] DEBUG: Restoring privileges
[+13523.74s] DEBUG: Starting session ubuntu as user jim
[+13523.74s] DEBUG: Session 2278 running command /usr/sbin/lightdm-session gnome-session --session=ubuntu
[+13524.05s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session1
[+13524.05s] DEBUG: Session 2278 exited with return value 1
[+13524.06s] DEBUG: User session quit
[+13524.06s] DEBUG: Stopping display
[+13524.06s] DEBUG: Sending signal 15 to process 2185
[+13524.52s] DEBUG: Process 2185 exited with return value 0
[+13524.52s] DEBUG: X server stopped
[+13524.52s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
[+13524.52s] DEBUG: Releasing VT 7
[+13524.52s] DEBUG: Display server stopped
[+13524.52s] DEBUG: Display stopped
[+13524.52s] DEBUG: Active display stopped, switching to greeter
[+13524.52s] DEBUG: Switching to greeter
[+13524.52s] DEBUG: Starting new display for greeter
[+13524.52s] DEBUG: Starting local X display
[+13524.52s] DEBUG: Using VT 7
[+13524.52s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+13524.52s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+13524.52s] DEBUG: Launching X Server
[+13524.52s] DEBUG: Launching process 5170: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+13524.52s] DEBUG: Waiting for ready signal from X server :0
[+13525.20s] DEBUG: Got signal 10 from process 5170
[+13525.20s] DEBUG: Got signal from X server :0
[+13525.20s] DEBUG: Connecting to XServer :0
[+13525.21s] DEBUG: Starting greeter
[+13525.21s] DEBUG: Started session 5175 with service 'lightdm', username 'lightdm'
[+13525.30s] DEBUG: Session 5175 authentication complete with return value 0: Success
[+13525.30s] DEBUG: Greeter authorized
[+13525.30s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log
[+13525.32s] DEBUG: Session 5175 running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
[+13526.85s] DEBUG: Greeter connected version=1.2.1
[+13526.85s] DEBUG: Greeter connected, display is ready
[+13526.85s] DEBUG: New display ready, switching to it
[+13526.85s] DEBUG: Activating VT 7
[+13526.85s] DEBUG: Stopping greeter display being switched from
[+13529.59s] DEBUG: Greeter start authentication for jim
[+13529.59s] DEBUG: Started session 5260 with service 'lightdm', username 'jim'
[+13529.61s] DEBUG: Session 5260 got 1 message(s) from PAM
[+13529.61s] DEBUG: Prompt greeter with 1 message(s)

x-0 output:

X.Org X Server 1.11.3
Release Date: 2011-12-16
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.42-26-generic i686 Ubuntu
Current Operating System: Linux greentea 3.2.0-35-generic-pae #55-Ubuntu SMP Wed Dec 5 18:04:39 UTC 2012 i686
Kernel command line: BOOT_IMAGE=/vmlinuz-3.2.0-35-generic-pae root=/dev/mapper/local-root ro quiet splash vt.handoff=7
Build Date: 29 August 2012  12:10:05AM
xorg-server 2:1.11.4-0ubuntu10.8 (For technical support please see http://www.ubuntu.com/support) 
Current version of pixman: 0.24.4
    Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Jan 15 20:31:21 2013
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
Fulfilled via DRI at 33185280
Freed 33185280 (pool 2)

x-0-greeter.log output:

[+0.04s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.04s] DEBUG: Starting Light Display Manager 1.2.1, UID=0 PID=1309
[+0.04s] DEBUG: Loaded configuration from /etc/lightdm/lightdm.conf
[+0.04s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.14s] DEBUG: Registered seat module xlocal
[+0.14s] DEBUG: Registered seat module xremote
[+0.14s] DEBUG: Adding default seat
[+0.14s] DEBUG: Starting seat
[+0.14s] DEBUG: Starting new display for greeter
[+0.14s] DEBUG: Starting local X display
[+0.15s] DEBUG: X server :0 will replace Plymouth
[+0.17s] DEBUG: Using VT 7
[+0.17s] DEBUG: Activating VT 7
[+0.17s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+1.08s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+1.08s] DEBUG: Launching X Server
[+1.08s] DEBUG: Launching process 1345: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
[+1.08s] DEBUG: Waiting for ready signal from X server :0
[+1.08s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+1.08s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+5.47s] DEBUG: Got signal 10 from process 1345
[+5.47s] DEBUG: Got signal from X server :0
[+5.47s] DEBUG: Stopping Plymouth, X server is ready
[+5.49s] DEBUG: Connecting to XServer :0
[+5.50s] DEBUG: Starting greeter
[+5.50s] DEBUG: Started session 1409 with service 'lightdm', username 'lightdm'
[+6.28s] DEBUG: Session 1409 authentication complete with return value 0: Success
[+6.28s] DEBUG: Greeter authorized
[+6.28s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log
[+6.45s] DEBUG: Session 1409 running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
[+9.82s] DEBUG: Greeter connected version=1.2.1
[+9.82s] DEBUG: Greeter connected, display is ready
[+9.82s] DEBUG: New display ready, switching to it
[+9.82s] DEBUG: Activating VT 7
[+13.60s] DEBUG: Greeter start authentication for jim
[+13.60s] DEBUG: Started session 1806 with service 'lightdm', username 'jim'
[+13.68s] DEBUG: Session 1806 got 1 message(s) from PAM
[+13.68s] DEBUG: Prompt greeter with 1 message(s)
[+18.46s] DEBUG: Continue authentication
[+21.15s] DEBUG: Session 1806 authentication complete with return value 7: Authentication failure
[+21.15s] DEBUG: Authenticate result for user jim: Authentication failure
[+21.15s] DEBUG: Greeter start authentication for jim
[+21.15s] DEBUG: Session 1806: Sending SIGTERM
[+21.15s] DEBUG: Started session 2047 with service 'lightdm', username 'jim'
[+21.17s] DEBUG: Session 2047 got 1 message(s) from PAM
[+21.17s] DEBUG: Prompt greeter with 1 message(s)
[+30.73s] DEBUG: Continue authentication
[+34.08s] DEBUG: Session 2047 authentication complete with return value 0: Success
[+34.08s] DEBUG: Authenticate result for user jim: Success
[+34.12s] DEBUG: User jim authorized
[+34.14s] DEBUG: Greeter requests session ubuntu
[+34.14s] DEBUG: Using session ubuntu
[+34.14s] DEBUG: Stopping greeter
[+34.14s] DEBUG: Session 1409: Sending SIGTERM
[+34.25s] DEBUG: Session 1409 exited with return value 0
[+34.25s] DEBUG: Greeter quit
[+34.30s] DEBUG: Dropping privileges to uid 1000
[+34.30s] DEBUG: Restoring privileges
[+34.36s] DEBUG: Dropping privileges to uid 1000
[+34.36s] DEBUG: Writing /home/jim/.dmrc
[+34.36s] DEBUG: Restoring privileges
[+34.46s] DEBUG: Starting session ubuntu as user jim
[+34.46s] DEBUG: Session 2047 running command /usr/sbin/lightdm-session gnome-session --session=ubuntu
[+34.60s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session0
[+34.60s] DEBUG: Greeter closed communication channel
[+35.36s] DEBUG: Session 2047 exited with return value 1
[+35.36s] DEBUG: User session quit
[+35.36s] DEBUG: Stopping display
[+35.36s] DEBUG: Sending signal 15 to process 1345
[+35.63s] DEBUG: Process 1345 exited with return value 0
[+35.63s] DEBUG: X server stopped
[+35.63s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
[+35.63s] DEBUG: Releasing VT 7
[+35.63s] DEBUG: Display server stopped
[+35.63s] DEBUG: Display stopped
[+35.63s] DEBUG: Active display stopped, switching to greeter
[+35.63s] DEBUG: Switching to greeter
[+35.63s] DEBUG: Starting new display for greeter
[+35.63s] DEBUG: Starting local X display
[+35.63s] DEBUG: Using VT 7
[+35.63s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+35.63s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+35.63s] DEBUG: Launching X Server
[+35.63s] DEBUG: Launching process 2185: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+35.63s] DEBUG: Waiting for ready signal from X server :0
[+35.98s] DEBUG: Got signal 10 from process 2185
[+35.98s] DEBUG: Got signal from X server :0
[+35.98s] DEBUG: Connecting to XServer :0
[+35.98s] DEBUG: Starting greeter
[+35.98s] DEBUG: Started session 2190 with service 'lightdm', username 'lightdm'
[+36.04s] DEBUG: Session 2190 authentication complete with return value 0: Success
[+36.05s] DEBUG: Greeter authorized
[+36.05s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log
[+36.05s] DEBUG: Session 2190 running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
[+36.57s] DEBUG: Greeter connected version=1.2.1
[+36.57s] DEBUG: Greeter connected, display is ready
[+36.57s] DEBUG: New display ready, switching to it
[+36.57s] DEBUG: Activating VT 7
[+36.57s] DEBUG: Stopping greeter display being switched from
[+37.56s] DEBUG: Greeter start authentication for jim
[+37.56s] DEBUG: Started session 2278 with service 'lightdm', username 'jim'
[+37.59s] DEBUG: Session 2278 got 1 message(s) from PAM
[+37.59s] DEBUG: Prompt greeter with 1 message(s)
[+13520.98s] DEBUG: Continue authentication
[+13523.32s] DEBUG: Session 2278 authentication complete with return value 0: Success
[+13523.32s] DEBUG: Authenticate result for user jim: Success
[+13523.34s] DEBUG: User jim authorized
[+13523.39s] DEBUG: Greeter requests session ubuntu
[+13523.39s] DEBUG: Using session ubuntu
[+13523.39s] DEBUG: Stopping greeter
[+13523.39s] DEBUG: Session 2190: Sending SIGTERM
[+13523.60s] DEBUG: Greeter closed communication channel
[+13523.60s] DEBUG: Session 2190 exited with return value 0
[+13523.60s] DEBUG: Greeter quit
[+13523.63s] DEBUG: Dropping privileges to uid 1000
[+13523.63s] DEBUG: Restoring privileges
[+13523.67s] DEBUG: Dropping privileges to uid 1000
[+13523.67s] DEBUG: Writing /home/jim/.dmrc
[+13523.67s] DEBUG: Restoring privileges
[+13523.74s] DEBUG: Starting session ubuntu as user jim
[+13523.74s] DEBUG: Session 2278 running command /usr/sbin/lightdm-session gnome-session --session=ubuntu
[+13524.05s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session1
[+13524.05s] DEBUG: Session 2278 exited with return value 1
[+13524.06s] DEBUG: User session quit
[+13524.06s] DEBUG: Stopping display
[+13524.06s] DEBUG: Sending signal 15 to process 2185
[+13524.52s] DEBUG: Process 2185 exited with return value 0
[+13524.52s] DEBUG: X server stopped
[+13524.52s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
[+13524.52s] DEBUG: Releasing VT 7
[+13524.52s] DEBUG: Display server stopped
[+13524.52s] DEBUG: Display stopped
[+13524.52s] DEBUG: Active display stopped, switching to greeter
[+13524.52s] DEBUG: Switching to greeter
[+13524.52s] DEBUG: Starting new display for greeter
[+13524.52s] DEBUG: Starting local X display
[+13524.52s] DEBUG: Using VT 7
[+13524.52s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+13524.52s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+13524.52s] DEBUG: Launching X Server
[+13524.52s] DEBUG: Launching process 5170: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+13524.52s] DEBUG: Waiting for ready signal from X server :0
[+13525.20s] DEBUG: Got signal 10 from process 5170
[+13525.20s] DEBUG: Got signal from X server :0
[+13525.20s] DEBUG: Connecting to XServer :0
[+13525.21s] DEBUG: Starting greeter
[+13525.21s] DEBUG: Started session 5175 with service 'lightdm', username 'lightdm'
[+13525.30s] DEBUG: Session 5175 authentication complete with return value 0: Success
[+13525.30s] DEBUG: Greeter authorized
[+13525.30s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log
[+13525.32s] DEBUG: Session 5175 running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
[+13526.85s] DEBUG: Greeter connected version=1.2.1
[+13526.85s] DEBUG: Greeter connected, display is ready
[+13526.85s] DEBUG: New display ready, switching to it
[+13526.85s] DEBUG: Activating VT 7
[+13526.85s] DEBUG: Stopping greeter display being switched from
[+13529.59s] DEBUG: Greeter start authentication for jim
[+13529.59s] DEBUG: Started session 5260 with service 'lightdm', username 'jim'
[+13529.61s] DEBUG: Session 5260 got 1 message(s) from PAM
[+13529.61s] DEBUG: Prompt greeter with 1 message(s)

Please assists.

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1  
Which version of Ubuntu are you using ? and which login manager like GDM or LightDM ? Also, while on a tty check for proper permission and ownership of your home directory by ls -l /home/ and ls -la /home/<username> you should have read-write access for owner username:username where username is your proper username on system –  Gufran Jan 15 '13 at 16:44
    
I am running 12.04.1 LTS. I am using the login manager that shipped with Ubuntu. My home directory permissions and ownership is correct. –  Hendre Jan 15 '13 at 18:01
    
Here is the chain of event. I installed Oracle Java and made incorrect changes to the /etc/profile file. I also installed security updated that required a reboot. After the reboot the login screen started cycling. I logged in via tty and resolved the /etc/profile mistake. Still no luck. I then removed the .Xauthority and .xsession-error files and changed my password. Login screen still cycling. This is were I got stuck???? –  Hendre Jan 15 '13 at 18:04
    
Please update the question with content of /var/log/lightdm/x-0-greeter.log and /var/log/lightdm/x-0.log log files too. –  Gufran Jan 15 '13 at 20:17
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