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After using command gksudo, something happened with my graphic user interface, my menu was hidden, so I restarted unity with $unity --reset and my system got frozen, so I reboot my notebook and I could not login.
Now switch back to graphical mode with Ctrl + Alt + F7 and try again.
Solved by removing .Xauthority file from home folder ~.
Press Ctrl + Alt + F1 and login with your username:
mike@notebook:~$ rm .Xauthority 