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I installed gnome-core and now I have an ugly login screen. I want to reset or delete gnome-core and re-install the Unity login screen, or just switch back to LightDM. Is there any way to do it easily and quickly?

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up vote 2 down vote accepted

You should be able to do sudo dpkg-reconfigure gdm to switch between LightDM and GDM. So you'll reconfigure GDM even if it's LightDM you want to use.

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i tried that and it didnt work i want my login screen looks like that upload.wikimedia.org/wikipedia/commons/a/a8/… –  Andrew Nov 11 '12 at 10:38
    
its working. I figuret it out ... but it dont work when i click lock screen... –  Andrew Nov 11 '12 at 14:19
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