[ubuntu] Ubuntu 10.04 lts login screen reappearing

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http://ubuntuforums.org – Hi guys, I am new to linux. Right now I am having trouble with login. I am using the ubuntu 10.04 lts on my Lenovo E420 with dual boot. Yesterday I deleted pulse audio files as my volume control was not responding. But when I restarted after that the login GUI screen keeps reappearing after entering the password. But when I press ctrl+alt+F1 I get the terminal tty screen and there is no problem with login from there. Is there a work around this problem? Please help. Thanks. (Hardware)