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qjackctl is a gui; on linux that usually means its also an X11 client.

sorry, there's no command line only mode for qjackctl and i'm a bit of afraid it makes no sense at all being like so.

if what you want is controlling your headless machine you'll have to tell where a X-server (ie. graphical monitor screen) is located, by giving its IP address or hostname through the DISPLAY environment variable. eg.

cheers