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It just shows a black screen with words in it for a fraction of a second and then gets back to users screen(where you choose your user). I tried to enter from another account and removed the password for the admin account , but it didn't work too , and then I couldn't access my admin privileged places with my old password ?

What should I do ?

I tried to change my password from recovery but no success.

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Same happened with me also (in Ubuntu 12.04) I did the following. Hope its of some help.

  • Enter the log in screen
  • Press CTRL+ALT+F1, (to revert back press CTRL+ALT+F7, though it won't be needed)
  • login with your username/password
  • ls -Shla | grep "Xauthority"
  • sudo mv .Xauthority Xauthority.old
  • sudo shutdown -r now
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