[ubuntu] Cannot log in

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http://ubuntuforums.org – Hello! I've run into a bit of a problem with my Ubuntu system recently. I was installing MATLAB on my Ubuntu partition (I dual boot Windows XP/Ubuntu on an old laptop) and upon rebooting I was not able to log in to my Ubuntu system. The login screen appears and I can enter my password, but upon doing so the screen flashes black, takes a few seconds, and reloads the initial login page. No change. There is also an error message in the upper right corner with the text: "Install problem! The configuration defaults for GNOME Power Manager have not been installed correctly. Please contact yo (Hardware)