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I am trying to uninstall Vivado on Fedora. But it will not let me. I am told that I need to do the following

To work around this, set the DISPLAY value to a host and port that can 
be accessed in root mode. 

I don't know what this mean. How do I figure out what the host and port name that can be accessed in root mode is? And then how do I set the DISPLAY variable to this.

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