/usr/share/dbus-1/system-services/org.gnome.GConf.Defaults.service is in gconf-defaults-service 3.2.6-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [D-BUS Service]
Name=org.gnome.GConf.Defaults
Exec=/usr/lib/x86_64-linux-gnu/gconf/gconf-defaults-mechanism
User=root
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