/usr/share/dbus-1/services/org.kde.knotify.service is in kde-runtime-data 4:4.8.2-0ubuntu2.
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.knotify
Exec=/usr/bin/knotify4
|