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My system is Ubuntu 11.10, Laptop Lenovo G570

I was having problems with hibernating so I looked up a couple of answers and tried a made the mistake of trying

sudo apt-get -remove pm-utils --purge"
sudo apt-get install pm-utils"

Then I restarted and at the login screen, I type my password and press enter, it flickers then crashes back to the login screen

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up vote 2 down vote accepted

Try these at login terminal ( Ctrl+F1)

sudo apt-get install --reinstall ubuntu-desktop

also check the logs at ~/.xsession-errors and /var/log/Xorg.0.log

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