/usr/share/dbus-1/services/org.gtk.Private.GoaVolumeMonitor.service is in gvfs-backends 1.22.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=org.gtk.Private.GoaVolumeMonitor
Exec=/usr/lib/gvfs/gvfs-goa-volume-monitor
|