Binary package “python3-dbus.mainloop.pyqt5-dbg” in ubuntu focal

D-Bus Qt main loop support for Python 3 (debug extension)

 The dbus.mainloop.pyqt5 module provides support for Qt main loop for
 applications that use dbus-python. By default Qt uses main loop from
 GLib on UNIX-like systems, not its own one.
 This package contains the extension built for the Python 3 debug interpreter.