/usr/lib/gnome-settings-daemon-3.0/gtk-modules/pk-gtk-module.desktop is in packagekit-gtk3-module 0.7.2-4ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [GTK Module]
Name=PackageKit
Description=PackageKit Font Installer
X-GTK-Module-Name=pk-gtk-module
|