I just installed Kubuntu alongside Ubuntu 12.04, and it changed my login screen. I liked the Ubuntu one and would like to set it back to the default. How can i do that?
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Run this command in the terminal-
sudo dpkg-reconfigure lightdm
You will get the following screen:

then enter on OK and you will get a screen similar to this with listings as KDM and LIGHTDM

scroll down the navigation to lightdm and press enter.
you will get the ubuntu login screen back.
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@ Gevorg. Thanx for the edit.Can i know how to bring in those greay highlighters?? – Nirmik May 17 '12 at 18:57
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Do you need to reboot for this to work? – Christopher King Apr 20 '14 at 19:14
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@PyRulez yup... – Nirmik Apr 25 '14 at 07:10