I cannot load KDE, XFCE or any desktop environment other than GNOME in my Fedora 22 system. Every time I try startkde I get $DISPLAY is not set or cannot connect to X server. Tried all the solutions here, here and here and it still doesn't work. How to fix this?

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    If you don't get a useful response here, you could always try the KDE forums. They are usually extremely helpful. – Sparhawk Sep 13 '15 at 8:52

If you type in a shell

type X

and there's an error, you forgot to install xorg-server.

Check this too :

fgrep '(EE)' /var/log/Xorg.0.log

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