/usr/share/app-install/desktop/lightdm-gtk-greeter-settings:lightdm-gtk-greeter-settings.desktop is in app-install-data 15.10.
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 13 14 15 16 | [Desktop Entry]
X-AppInstall-Package=lightdm-gtk-greeter-settings
X-AppInstall-Popcon=15
X-AppInstall-Section=universe
Name=LightDM GTK+ Greeter settings
Comment=Configure LightDM GTK+ Greeter
Categories=GNOME;GTK;Settings;System;Utility;X-XFCE-SettingsDialog;X-XFCE-SystemSettings;
Keywords=Configuration;Utility;
Exec=lightdm-gtk-greeter-settings-pkexec
Icon=lightdm-gtk-greeter-settings
Terminal=false
Type=Application
X-XfcePluggable=true
X-Ubuntu-Gettext-Domain=app-install-data
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