/usr/share/app-install/desktop/unity-2d-meta.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 | [Desktop Entry]
X-AppInstall-Package=unity-2d
X-AppInstall-Popcon=1
X-AppInstall-Section=main
Name=Unity 2D
Icon=gnome-fs-desktop
Terminal=false
Type=Application
Categories=Utility
X-Ubuntu-Gettext-Domain=app-install-data
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