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f24 cannot open display: :0 NOT using wayland!?

Programs like gedit gparted or even xrandr are failing with the error stated above. Booting into GNOME or KDE won't help. I tried everything that I found on google.

Even xauth + will result in the same error.

export DISPLAY=:0 is set permanently in /etc/environment.

I don't know what I am missing here.