/usr/share/glib-2.0/schemas/org.gnome.settings-daemon.gtk-modules-packagekit.gschema.xml 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 5 6 7 8 9 10 11 12 | <schemalist>
<schema id="org.gnome.settings-daemon" path="/org/gnome/settings-daemon/">
<child name="gtk-modules" schema="gnome-settings-daemon.gtk-modules"/>
</schema>
<schema id="gnome-settings-daemon.gtk-modules" path="/org/gnome/settings-daemon/gtk-modules/">
<key name="pk-gtk-module" type="b">
<default>true</default>
<summary>PackageKit GTK+ module for font installation</summary>
<description>This key determines if applications should be able to prompt for fonts.</description>
</key>
</schema>
</schemalist>
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