/usr/share/applications/screensavers/apollonian.desktop is in xscreensaver-data-extra 5.15-2ubuntu1.
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 | [Desktop Entry]
Name=Apollonian
Exec=/usr/lib/xscreensaver/apollonian -root
TryExec=/usr/lib/xscreensaver/apollonian
Comment=Draws an Apollonian gasket: a fractal packing of circles with smaller circles, demonstrating Descartes's theorem. http://en.wikipedia.org/wiki/Apollonian_gasket http://en.wikipedia.org/wiki/Descartes%27_theorem Written by Allan R. Wilks and David Bagley.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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