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Change now to use Unity:Typing the following only changes the login screen to Unity. Once logged in, KDE loads. To load the windows manager of your choice, you make the selection at the login screen. There is an icon you click, and you can select the WM to load from a list of those installed.Change back to KDE: sudo dpkg-reconfigure kdm Changing the theme from within the GUI: System Settings->Login Screen*Ubuntu = Unity *Kubuntu = KDE*Xubuntu = XFCE*Lubuntu = LXDE*Ubuntu GNOME = GNOME