Hoy no puedo entrar en la GUI, pero puedo usar la consola ( Ctrl + Alt + F1 ) para entrar como usuario o como root, y puedo entrar por ssh.
Bajo Natty, antes de la actualización, había configurado Ubuntu para auto-iniciar sesión como usuario. El viernes el autologin funcionaba con 12.04. Hoy se me presenta la pantalla de inicio de sesión por primera vez. No se me pide el ID de usuario, sólo la contraseña.
$ sudo cat /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.2.1, UID=0 PID=1421
[+0.00s] DEBUG: Loaded configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: Registered seat module xlocal
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Adding default seat
[+0.00s] DEBUG: Starting seat
[+0.00s] DEBUG: Starting new display for automatic login as user mslinn
[+0.00s] DEBUG: Starting local X display
[+0.02s] DEBUG: X server :0 will replace Plymouth
[+0.04s] DEBUG: Using VT 7
[+0.04s] DEBUG: Activating VT 7
[+0.04s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+0.04s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+0.04s] DEBUG: Launching X Server
[+0.04s] DEBUG: Launching process 1452: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
[+0.04s] DEBUG: Waiting for ready signal from X server :0
[+0.04s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.04s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.41s] DEBUG: Got signal 10 from process 1452
[+0.41s] DEBUG: Got signal from X server :0
[+0.41s] DEBUG: Stopping Plymouth, X server is ready
[+0.43s] DEBUG: Connecting to XServer :0
[+0.43s] DEBUG: Automatically logging in user mslinn
[+0.43s] DEBUG: Started session 1524 with service 'lightdm-autologin', username 'mslinn'
[+0.49s] DEBUG: Session 1524 authentication complete with return value 0: Success
[+0.49s] DEBUG: Autologin user mslinn authorized
[+0.49s] DEBUG: Autologin using session xterm
[+0.50s] DEBUG: Dropping privileges to uid 1000
[+0.50s] DEBUG: Restoring privileges
[+0.51s] DEBUG: Dropping privileges to uid 1000
[+0.51s] DEBUG: Writing /home/mslinn/.dmrc
[+0.53s] DEBUG: Restoring privileges
[+0.57s] DEBUG: Starting session xterm as user mslinn
[+0.57s] DEBUG: Session 1524 running command /usr/sbin/lightdm-session xterm
[+0.65s] DEBUG: New display ready, switching to it
[+0.65s] DEBUG: Activating VT 7
[+0.66s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session0
[+0.89s] DEBUG: Session 1524 exited with return value 0
[+0.97s] DEBUG: User session quit
[+0.97s] DEBUG: Stopping display
[+0.97s] DEBUG: Sending signal 15 to process 1452
[+2.20s] DEBUG: Process 1452 exited with return value 0
[+2.20s] DEBUG: X server stopped
[+2.20s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
[+2.20s] DEBUG: Releasing VT 7
[+2.20s] DEBUG: Display server stopped
[+2.20s] DEBUG: Display stopped
[+2.20s] DEBUG: Active display stopped, switching to greeter
[+2.20s] DEBUG: Switching to greeter
[+2.20s] DEBUG: Starting new display for greeter
[+2.20s] DEBUG: Starting local X display
[+2.20s] DEBUG: Using VT 7
[+2.20s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+2.21s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+2.21s] DEBUG: Launching X Server
[+2.21s] DEBUG: Launching process 1758: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+2.21s] DEBUG: Waiting for ready signal from X server :0
[+2.43s] DEBUG: Got signal 10 from process 1758
[+2.43s] DEBUG: Got signal from X server :0
[+2.43s] DEBUG: Connecting to XServer :0
[+2.43s] DEBUG: Starting greeter
[+2.43s] DEBUG: Started session 1766 with service 'lightdm', username 'lightdm'
[+2.61s] DEBUG: Session 1766 authentication complete with return value 0: Success
[+2.61s] DEBUG: Greeter authorized
[+2.61s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log
[+2.66s] DEBUG: Session 1766 running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
[+3.12s] DEBUG: Greeter connected version=1.2.1
[+3.12s] DEBUG: Greeter connected, display is ready
[+3.12s] DEBUG: New display ready, switching to it
[+3.12s] DEBUG: Activating VT 7
[+3.12s] DEBUG: Stopping greeter display being switched from
[+3.91s] DEBUG: Greeter start authentication for mslinn
[+3.91s] DEBUG: Started session 2219 with service 'lightdm', username 'mslinn'
[+3.99s] DEBUG: Session 2219 got 1 message(s) from PAM
[+3.99s] DEBUG: Prompt greeter with 1 message(s)He intentado desinstalar y volver a instalar lightdm pero eso no sirvió de nada.
Tengo 3 sistemas Ubuntu virtualizados; dos de ellos tienen este problema. ¿Qué debo hacer?
