Fixing the 'Cannot Open Display' Error on Linux - Linux Tutorials - Learn Linux Configuration

The Cannot Open Display error can occur on a Linux system when trying to open a GUI application, especially if opening it from the command line. It can also pop up if you are trying to use X11 forwarding via SSH to a remote system. The good news is that this error is relatively easy to fix, whether you are getting it when accessing a local application or a remote server. In this tutorial, we will cover the steps necessary to fix the Cannot Open Display error on Linux.

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I may be completely missing something, but I think the code $ echo DISPLAY at steps 1 & 2 should be $ echo $DISPLAY ?