/usr/share/app-install/desktop/evolvotron:evolvotron.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.
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X-AppInstall-Package=evolvotron
X-AppInstall-Popcon=12
X-AppInstall-Section=universe
Type=Application
Version=0.4.0
Name=Evolvotron
Exec=evolvotron
Terminal=false
Categories=Graphics;2DGraphics;
Comment=Interactive image generator
Keywords=art;evolution;generate;generative;texture;random;mutation;genetic
X-Ubuntu-Gettext-Domain=app-install-data
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