X Virtual Framebuffer (Xvfb) is a great quick application to run applications that expect a X11 server, but you don’t care to see the visual output.
To install:
sudo apt install xvfb
To run:
xvfb-run application
For more customization, I hear that it’s better to use xpra with Xdummy. I haven’t tried this myself yet, but if you experience issues with the application expecting randr or glx extensions, give it a shot.
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