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I installed Xubuntu, I was happy with xfce4 interface but then I decided to try out the other ones, so I installed kde and gnome just so I get to know which one is best for me.

Problem is, now when I start my computer, the login screen is using KDE screen. I can still choose xfce interface when logging a user, but at the login screen I'm stuck with KDE, how do I change that without having to unistall kde?

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try sudo dpkg-reconfigure lightdm and select which login screen you want lightdm or gdm etc.. – harish.venkat Dec 24 '12 at 20:00

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