Не удается войти в Ubuntu после обновления до 12.04 [закрыто]

Сегодня я не могу войти в графический интерфейс, но я могу использовать консоль (Ctrl + Alt + F1) для входа в систему как пользователь или как пользователь root, и я могу войти через ssh.

Under Natty , перед обновлением я настроил Ubuntu на автоматический вход в систему как пользователь. В пятницу автолог работал с 12.04. Сегодня мне впервые представлен экран входа в систему. Я не запрашиваю идентификатор пользователя, просто для пароля.

    $ 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)

Я попытался деинсталлировать и переустановить lightdm, но это не помогло.

У меня есть 3 виртуализированных Системы Ubuntu; две из них имеют эту проблему. Что мне делать?