This is the first time I'm having problems during Ubuntu upgrade. I have nothing to do except pressing the power button until shutdown in the black screen when I choose to Log out from the session indicator menu. Any ideas that can help me out will be much appreciated. I hope I don't have to do a clean install to get rid of this minor problem.
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sudo service lightdm restart
to restart your session without having to power off the machine. – Insperatus Oct 23 '13 at 02:18