I'm not sure if this is the same bug, but neither lightdm or gdm will start a session for me. For both lightdm and gdm with any kind of session (unity, unity2d, classic, xfce ...) the gui dies and flashes what was on console 7 and then restarts. My only way in is console 1 text login, stopping lightdm and running startx.
It happened about not quite 2 weeks ago - I am running 12.04 beta. I had hoped the 12.04 release would fix it but no dice. The .xsession-errors follows but isn't particularly enlightening No protocol specified No protocol specified xrdb: Resource temporarily unavailable xrdb: Can't open display ':0' No protocol specified No protocol specified xrdb: Resource temporarily unavailable xrdb: Can't open display ':0' No protocol specified No protocol specified xhost: unable to open display ":0" No protocol specified No protocol specified xhost: unable to open display ":0" openConnection: connect: No such file or directory cannot connect to brltty at :0 No protocol specified No protocol specified No protocol specified No protocol specified ** (gnome-session:5675): WARNING **: Cannot open display: -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. 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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