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xhost: unable to open display ":0.0"
The issue was due to access control; users connecting from a remote host are not allowed to open the display. To lift these constraints and fix the problem run the following command:
> sudo xhost +
Add the following to your .bashrc script (or whatever your shell’s equivalent is):
> export DISPLAY=:0.0
Finally whenever logging into your remote server, remember to use the -Y flag to enable X11 window forwarding.
> ssh username@hostname -Y