/usr/share/applications/screensavers/hypertorus.desktop is in xscreensaver-gl 5.15-3ubuntu1.
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=Hypertorus
Exec=/usr/lib/xscreensaver/hypertorus -root
TryExec=/usr/lib/xscreensaver/hypertorus
Comment=This shows a rotating Clifford Torus: a torus lying on the "surface" of a 4D hypersphere. Inspired by Thomas Banchoff's book "Beyond the Third Dimension: Geometry, Computer Graphics, and Higher Dimensions", Scientific American Library, 1990. http://en.wikipedia.org/wiki/N-sphere http://en.wikipedia.org/wiki/Clifford_torus http://en.wikipedia.org/wiki/Regular_polytope Written by Carsten Steger.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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