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I had been using Ubuntu Gnome for over 3 months now, without any issues. Today, when I tried to boot the os, I couldn't see the login screen. Instead, it shows the Screen with Gnome logo and it isn't going to the login screen. I checked whether my disk is full, because I had a similiar experience before because my disk was full, but there is 53% free space. I tried a few commands I saw from online forums by going to the textual login screen, like "sudo dpkg-reconfigure gdm", and I even booted the os in recovery mode and run clean and fix package errors, but in vain. I tried installing lightdm and I was able to access the login screen. But when I login, I am getting dark background, and very different and pretty basic and minimal GUI. When I tried to login with Gnome, I got a GUI without any menu bar and none of the keys are working. I am in the middle of my academic project and this issue is making me nuts, someone please help me solve the issue.

Output for /var/log/lightdm/lightdm.log is

[+0.02s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.02s] DEBUG: Starting Light Display Manager 1.8.4, UID=0 PID=1021
[+0.02s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf.d/10-ubuntu.conf
[+0.02s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf.d/20-gnome.conf
[+0.02s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
[+0.02s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf.d/50-guest-wrapper.conf
[+0.02s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf.d/50-unity-greeter.conf
[+0.02s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf.d/50-xserver-command.conf
[+0.02s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.02s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.02s] DEBUG: Registered seat module xlocal
[+0.02s] DEBUG: Registered seat module xremote
[+0.02s] DEBUG: Registered seat module unity
[+0.02s] DEBUG: Registered seat module surfaceflinger
[+0.02s] DEBUG: Adding default seat
[+0.02s] DEBUG: Seat: Starting
[+0.02s] DEBUG: Seat: Creating greeter session
[+0.20s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+0.20s] DEBUG: Seat: Creating display server of type x
[+0.20s] DEBUG: Seat: Starting local X display
[+0.20s] DEBUG: Deactivating Plymouth
[+0.22s] DEBUG: Using VT 7
[+0.22s] DEBUG: DisplayServer x-0: Logging to /var/log/lightdm/x-0.log
[+0.22s] DEBUG: DisplayServer x-0: Writing X server authority to /var/run/lightdm/root/:0
[+0.22s] DEBUG: DisplayServer x-0: Launching X Server
[+0.22s] DEBUG: Launching process 1094: /usr/bin/X -core :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.22s] DEBUG: DisplayServer x-0: Waiting for ready signal from X server :0
[+0.22s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.22s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+1.79s] DEBUG: Got signal 10 from process 1094
[+1.79s] DEBUG: DisplayServer x-0: Got signal from X server :0
[+1.79s] DEBUG: DisplayServer x-0: Connecting to XServer :0
[+1.79s] DEBUG: Quitting Plymouth; retaining splash
[+1.88s] DEBUG: Seat: Display server ready, starting session authentication
[+1.88s] DEBUG: Session: Setting XDG_VTNR=7
[+1.88s] DEBUG: Session pid=1224: Started with service 'lightdm-greeter', username 'lightdm'
[+2.53s] DEBUG: Session pid=1224: Authentication complete with return value 0: Success
[+2.53s] DEBUG: Seat: Session authenticated, running command
[+2.53s] DEBUG: Session pid=1224: Setting XDG_VTNR=7
[+2.53s] DEBUG: Session pid=1224: Running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
[+2.55s] DEBUG: Session pid=1224: Logging to /var/log/lightdm/x-0-greeter.log
[+2.64s] DEBUG: Activating VT 7
[+4.08s] DEBUG: Session pid=1224: Greeter connected version=1.8.4
[+5.61s] DEBUG: Session pid=1224: Greeter start authentication for bnidhin
[+5.61s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+5.61s] DEBUG: Session: Setting XDG_VTNR=7
[+5.61s] DEBUG: Session pid=1616: Started with service 'lightdm', username 'bnidhin'
[+5.68s] DEBUG: Session pid=1224: Greeter start authentication for bnidhin
[+5.68s] DEBUG: Session pid=1616: Sending SIGTERM
[+5.68s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+5.68s] DEBUG: Session: Setting XDG_VTNR=7
[+5.68s] DEBUG: Session pid=1620: Started with service 'lightdm', username 'bnidhin'
[+5.68s] DEBUG: Session pid=1616: Terminated with signal 15
[+5.68s] DEBUG: Session: Failed during authentication
[+5.68s] DEBUG: Seat: Session stopped
[+5.75s] DEBUG: Session pid=1620: Got 1 message(s) from PAM
[+5.75s] DEBUG: Session pid=1224: Prompt greeter with 1 message(s)
[+10.84s] DEBUG: Session pid=1224: Greeter start authentication for lightdm
[+10.84s] DEBUG: Session pid=1620: Sending SIGTERM
[+10.84s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+10.84s] DEBUG: Session: Setting XDG_VTNR=7
[+10.84s] DEBUG: Session pid=1937: Started with service 'lightdm', username 'lightdm'
[+10.84s] DEBUG: Session pid=1620: Terminated with signal 15
[+10.84s] DEBUG: Session: Failed during authentication
[+10.84s] DEBUG: Seat: Session stopped
[+10.84s] DEBUG: Session pid=1937: Got 1 message(s) from PAM
[+10.84s] DEBUG: Session pid=1224: Prompt greeter with 1 message(s)
[+12.15s] DEBUG: Session pid=1224: Continue authentication
[+13.92s] DEBUG: Session pid=1937: Authentication complete with return value 7: Authentication failure
[+13.92s] DEBUG: Session pid=1224: Authenticate result for user lightdm: Authentication failure
[+13.93s] DEBUG: Session pid=1937: Exited with return value 1
[+13.93s] DEBUG: Seat: Session stopped
[+13.93s] DEBUG: Session pid=1224: Greeter start authentication for lightdm
[+13.93s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+13.93s] DEBUG: Session: Setting XDG_VTNR=7
[+13.93s] DEBUG: Session pid=1948: Started with service 'lightdm', username 'lightdm'
[+13.93s] DEBUG: Session pid=1948: Got 1 message(s) from PAM
[+13.93s] DEBUG: Session pid=1224: Prompt greeter with 1 message(s)
[+18.74s] DEBUG: Session pid=1224: Continue authentication
[+20.93s] DEBUG: Session pid=1948: Authentication complete with return value 7: Authentication failure
[+20.93s] DEBUG: Session pid=1224: Authenticate result for user lightdm: Authentication failure
[+20.93s] DEBUG: Session pid=1948: Exited with return value 1
[+20.93s] DEBUG: Seat: Session stopped
[+20.93s] DEBUG: Session pid=1224: Greeter start authentication for lightdm
[+20.93s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+20.93s] DEBUG: Session: Setting XDG_VTNR=7
[+20.93s] DEBUG: Session pid=2038: Started with service 'lightdm', username 'lightdm'
[+20.94s] DEBUG: Session pid=2038: Got 1 message(s) from PAM
[+20.94s] DEBUG: Session pid=1224: Prompt greeter with 1 message(s)
[+27.30s] DEBUG: Session pid=1224: Cancel authentication
[+27.31s] DEBUG: Session pid=2038: Sending SIGTERM
[+27.31s] DEBUG: Session pid=2038: Terminated with signal 15
[+27.31s] DEBUG: Session: Failed during authentication
[+27.31s] DEBUG: Seat: Session stopped
[+134.52s] DEBUG: Session pid=1224: Greeter start authentication for bnidhin
[+134.52s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+134.52s] DEBUG: Session: Setting XDG_VTNR=7
[+134.52s] DEBUG: Session pid=2058: Started with service 'lightdm', username 'bnidhin'
[+134.53s] DEBUG: Session pid=2058: Got 1 message(s) from PAM
[+134.53s] DEBUG: Session pid=1224: Prompt greeter with 1 message(s)
[+135.63s] DEBUG: Session pid=1224: Greeter start authentication for others
[+135.63s] DEBUG: Session pid=2058: Sending SIGTERM
[+135.63s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+135.63s] DEBUG: Session: Setting XDG_VTNR=7
[+135.64s] DEBUG: Session pid=2059: Started with service 'lightdm', username 'others'
[+135.64s] DEBUG: Session pid=2058: Terminated with signal 15
[+135.64s] DEBUG: Session: Failed during authentication
[+135.64s] DEBUG: Seat: Session stopped
[+135.65s] DEBUG: Session pid=2059: Got 1 message(s) from PAM
[+135.65s] DEBUG: Session pid=1224: Prompt greeter with 1 message(s)
[+135.84s] DEBUG: Session pid=1224: Greeter start authentication for guest account
[+135.84s] DEBUG: Session pid=2059: Sending SIGTERM
[+135.84s] DEBUG: Session pid=2059: Terminated with signal 15
[+135.84s] DEBUG: Session: Failed during authentication
[+135.84s] DEBUG: Seat: Session stopped
[+137.25s] DEBUG: Session pid=1224: Greeter start authentication for others
[+137.25s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+137.25s] DEBUG: Session: Setting XDG_VTNR=7
[+137.25s] DEBUG: Session pid=2060: Started with service 'lightdm', username 'others'
[+137.26s] DEBUG: Session pid=2060: Got 1 message(s) from PAM
[+137.26s] DEBUG: Session pid=1224: Prompt greeter with 1 message(s)
[+137.45s] DEBUG: Session pid=1224: Greeter start authentication for bnidhin
[+137.45s] DEBUG: Session pid=2060: Sending SIGTERM
[+137.45s] DEBUG: Seat: Setting XDG_SEAT=seat0
[+137.45s] DEBUG: Session: Setting XDG_VTNR=7
[+137.45s] DEBUG: Session pid=2061: Started with service 'lightdm', username 'bnidhin'
[+137.45s] DEBUG: Session pid=2060: Terminated with signal 15
[+137.45s] DEBUG: Session: Failed during authentication
[+137.45s] DEBUG: Seat: Session stopped
[+137.46s] DEBUG: Session pid=2061: Got 1 message(s) from PAM
[+137.46s] DEBUG: Session pid=1224: Prompt greeter with 1 message(s)
[+139.77s] DEBUG: Session pid=1224: Continue authentication
[+139.84s] DEBUG: Session pid=2061: Authentication complete with return value 0: Success
[+139.84s] DEBUG: Session pid=1224: Authenticate result for user bnidhin: Success
[+139.87s] DEBUG: Session pid=1224: User bnidhin authorized
[+139.88s] DEBUG: Session pid=1224: Greeter requests session ubuntu
[+139.96s] DEBUG: Writing /home/bnidhin/.dmrc
[+140.07s] DEBUG: Seat: Stopping greeter; display server will be re-used for user session
[+140.07s] DEBUG: Session pid=1224: Sending SIGTERM
[+140.10s] DEBUG: Session pid=1224: Greeter closed communication channel
[+140.10s] DEBUG: Session pid=1224: Exited with return value 0
[+140.10s] DEBUG: Seat: Session stopped
[+140.10s] DEBUG: Seat: Greeter stopped, running session
[+140.10s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManager/Session0
[+140.10s] DEBUG: Session pid=2061: Setting XDG_VTNR=7
[+140.10s] DEBUG: Session pid=2061: Running command /usr/sbin/lightdm-session gnome-session --session=ubuntu
[+140.10s] DEBUG: Session pid=2061: Logging to .xsession-errors
[+140.11s] DEBUG: Activating VT 7
share|improve this question
    
can you please post output /var/log/lightdm/lightdm.log and /var/log/lightdm/x-o.log. –  Farooq Mar 11 at 16:11
    
@Farooq : I can't post the log as the comment, since it is too long. so i've edited the post to add the log with it. Also there is no content in the x-o.log file. Any help would be greatly appreciated. –  Nidhin Balakrishnan Mar 11 at 16:25

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