Solution for Display Error - Linux

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Each new system user needs to be configured separetly.

Do the following:

1. Export DISPLAY variable:

Code:
export DISPLAY=localhost:0.0

Asign x-host privileges:

Code:
xhost local:oracle

Assuming oracle is a user I would like to asign xhost privileges.

3. Run x-window program:

Code:
xcalc, xclock etc..