/usr/share/app-install/desktop/xboard:xboard.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=xboard
X-AppInstall-Popcon=75
X-AppInstall-Section=universe
Name=Xboard
Comment=Chess Game
GenericName=Chess Game
Type=Application
Categories=Game;BoardGame;
Exec=xboard
Icon=xboard
X-Ubuntu-Gettext-Domain=app-install-data
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