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I installed The GNOME Desktop Environment, with extra components, but I didn't like it, so I uninstalled it. But now at the login screen, besides the password box there's still the button to choose Unity, Gnome and Gnome basic or something like that. How can I completely remove it?

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@MHC, thanks for the edit. I didn't do anything other than the italics because there recently were questions raised about editing questions to fit the answers. – user25656 Apr 14 '13 at 12:55
up vote 1 down vote accepted

I remember reading somewhere that (sudo) deleting what you don't need from /usr/share/xsessions will clean up your login screen. While the titles of the .desktop files are quite explanatory, you could make sure by viewing their contents in a text editor. Just to be safe, copy those .desktop files elsewhere first!

See How can I use LightDM for user-defined sessions? for more.

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