This bug was fixed in the package qjackctl - 0.4.2-0ubuntu2
--------------- qjackctl (0.4.2-0ubuntu2) xenial; urgency=medium
* Extend 90_dbus_setting.patch to enable JACK D-Bus interface too (LP: #1567589).
-- Dmitry Shachnev <email address hidden> Thu, 07 Apr 2016 23:01:12 +0200
This bug was fixed in the package qjackctl - 0.4.2-0ubuntu2
---------------
qjackctl (0.4.2-0ubuntu2) xenial; urgency=medium
* Extend 90_dbus_ setting. patch to enable JACK D-Bus interface too
(LP: #1567589).
-- Dmitry Shachnev <email address hidden> Thu, 07 Apr 2016 23:01:12 +0200