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I am not sure if it is safe to install more desktop environments. What versions are safe? I would like to have Gnome and KDE on Ubuntu. Last time I installed Gnome-full has broken my login screen and it was not ubuntu login screen anymore. It was like Gnome login that I saw in Debian.

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up vote 1 down vote accepted

Installing Gnome 3 (Unity and Gnome Shell) and KDE will result in software from both environments in the Menu, such as the Unity dash and the Gnome Shell applications grid and just as that Gnome Software appearing in KDE's menus.

GTK software will most likely than not appear bad looking in KDE and viceversa, to remedy that you should use the oxygen-gtk theme for GTK software in KDE and use qt4-qtconfig to theme K software under Gnome 3.

Nothing will brake, not that I know of. When you install one of the two you will be asked what Display Manager you want to use (GDM or KDM or LightDM).

Also, the vanilla Ubuntu package which contains unity is called ubuntu-desktop, the one with vanilla gnome is gnome and the one with vanilla KDE is kde-full, that is different from the kubuntu-desktop package.

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Thank you this really helped me. I was not sure what are those display managers but now I know. Thanks. – PLANTROON Jul 31 '12 at 22:09

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