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I'm using comparepdf (installed from ubuntu apt) to run automated tests which works fine on my desktop, but not on the server, the error returned is:

comparepdf: cannot connect to X server

This surprised me as I assumed comparepdf is a CLI tool, it doesn't have a GUI. But perhaps in the background it renders PDFs for comparison, for which it needs a GUI.

So what is the most minimal package I can install that might satisfy comparepdf?

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