If you get error messages like this ---
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified
xhost: unable to open display ":0.0"
when running a program, you probably need to add the user to the X server access list.
You can add a user to the X server access list with
# xhost +local:username
This allows "username" to connect to the local running X server.
link: http://www.captain.at/howto-xlib-connection-refused-by-server.php
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