GUI Applications
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Step 1: Installing an X Server
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In order to run GUI applications in WSL, you need to first install an X Server on your Windows machine. 
I recommend installing `Xming <https://sourceforge.net/projects/xming/>`_. 

Step 2: Set DISPLAY Environment Variable
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Next, you have to tell your WSL environment to use the X Server by setting the ``DISPLAY`` environment variable. 

I added the following to my ``~/.bashrc``::

    export DISPLAY=:0