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i've same problem with Ubuntu 18.04 which i updated to ubuntustudio using official repositories.

With Ubuntu 18.04 comes Qjackctl 0.4.5. I tried the AppImage 0.5.5 but had the same behavior: The Qjackctl application displays in message window that jack is started but no jack applications can connect to the jack server.

When i start the daemon manually "jackd ..." it works.

So i installed the Qjackctl 0.4.2 version as suggested which works fine.