I was using ubuntu 12.04 LTS version and everything was working fine. Yesterday I decided to update using the option in the update manager to ubuntu 14. Everything went smoothly in the installation BUT after the restart when I tried to boot ubuntu I was stuck in a grey/white screen (no login possible)... Please tell me that there is a solution in this that does not require complete format of the operating system! I am not proficient in using ubuntu so please if you make any suggestion like check graphic card do tell me how to do it or redirect me to an adequate tutorial...
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EDIT: Reinstall Ubuntu or use LiveDVD, because tty doesn't work
Try Ctrl + Alt + F6 to enter tty6. (Also possible with 1-5)
There you can try to reinstall ubuntu-desktop or choose another window manager
