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Same Problem: Ubuntu 12.04 LTS. Returns to the login screen in all GUI modes despite I enter the correct password.

Solution found in this blog -

  1. Log with Guest user

  2. Ctrl+Alt+F1 to log as I couldn't log before, or if preferred as root.

  3. rm /home//.Authority to remove this file

  4. Ctrl+Alt+F7 to go back to Guest session and try to log as >>>> SUCCESS

THANKS A LOT TO EVERYBODY AND SPECIALLY TO Lili

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Questions are for questions - please post your answer by filling the "answer" field below. Although: "same question" implies this might be a duplicate, then please post your answer to that question. –  guntbert Nov 8 '13 at 22:03
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marked as duplicate by user68186, guntbert, karel, jrg Jan 2 at 2:59

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