libqt4-dbus binary package in Ubuntu Bionic armhf

 Qt is a cross-platform C++ application framework. Qt's primary feature
 is its rich set of widgets that provide standard GUI functionality.
 .
 The QtDBus module is a Unix-only library that you can use to make Inter-Process
 Communication using the D-Bus protocol.
 .
 Applications using the QtDBus module can provide services to other, remote
 applications by exporting objects, as well as use services exported by those
 applications by placing calls and accessing properties.

Source package