[lubuntu] Fresh lubuntu install - can't login to GUI

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http://ubuntuforums.org – I just did a fresh install of lubuntu, but when I try to login, the window just flickers and then returns to the login again. I can login using Guest and it works fine, but when I use my username, no luck. I have tried changing my .Xauthority permissions, but still no luck. Anybody got any ideas? (Hardware)