Ubuntu x-windows problem fix.

Recently one of our desktop after restart distorted the whole screen.

Tried below steps to solve the problem.

1. Reinstall ubuntu-desktop (didn't work)
sudo apt-get remove ubuntu-desktop (removed ubuntu desktop)
sudo apt-get install ubuntu-desktop (re-installed it)

2. sudo dpkg --configure -a (didn't work)

3. sudo dpkg-reconfigure xserver-xorg (this solved the problem)
After issuing the command went through all configuration screens, selected defaults and rebooted ubuntu to see the login screens undistorted.


Note:
1. From login screen to go to command line use "Ctrl + Alt + F1"
2. To go back to login screen use "Ctrl + Alt + F7"
Looks like ubuntu has 6 tty sessions. F7 takes you to x-windows.