/usr/share/dbus-1/services/org.kde.fontinst.service is in plasma-desktop-data 4:5.8.6-1.
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.kde.fontinst
Exec=/usr/lib/x86_64-linux-gnu/libexec/kauth/fontinst
|