I accidentally installed KDE on my Ubuntu 12.04 Machine the other day, to find I really don't have a liking for it. I runned a apt-get command to remove the kde-full package, but programs like Konsole, Kmouth, and the KDE login screen still remained on my machine. I've looked at other posts on this community, but none of the methods have worked for me so far. Somebody has recommended to use an apt-get command to remove all traces, but this what I recieved:

Virtual packages like 'kdepim-groupware' can't be removed
Virtual packages like 'mysql-client-core-5.1' can't be removed
Virtual packages like 'mysql-server-core-5.1' can't be removed
Virtual packages like 'plasma-widget-kimpanel-backend-ibus' can't be removed
E: Unable to locate package kdepim-wizards
E: Unable to locate package libattica0
E: Unable to locate package libgps19
E: Unable to locate package libkwineffects1abi2
E: Unable to locate package libkworkspace4
E: Unable to locate package libokularcore1
E: Unable to locate package libplasmaclock4abi2
E: Unable to locate package libtaskmanager4abi2
E: Unable to locate package libzip1

I really don't care, I currently use Unity and GNOME and I don't mind if KDE sits there. But, it would be nice to return to the default login screen.