/usr/share/app-install/desktop/nitrogen:nitrogen.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 | [Desktop Entry]
X-AppInstall-Package=nitrogen
X-AppInstall-Popcon=21
X-AppInstall-Section=universe
Type=Application
Exec=nitrogen
Name=nitrogen
Categories=Utility;GTK
Icon=nitrogen
Comment=Browse and set desktop backgrounds
Keywords=background;desktop;
X-Ubuntu-Gettext-Domain=app-install-data
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