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After must frustration I return victorious. I had to make a file '99-realtime.conf' in /etc/security/limits.d' with the lines:

@realtime - rtprio 99
@realtime - memlock unlimited

Then commands 'sudo groupadd realtime' (it may already exists) 'usermod -a -G realtime yourUserName'.
You then must log off for changes to take effect.

You make QJackCtl: would it be possible to detect this problems and prompt to run a script that fixes it? Or even just a helpful error with steps to do it manually.