/usr/share/applications/screensavers/glknots.desktop is in xscreensaver-gl 5.36-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=GLKnots
Exec=/usr/lib/xscreensaver/glknots -root
TryExec=/usr/lib/xscreensaver/glknots
Comment=Generates some twisting 3d knot patterns. Spins 'em around. http://en.wikipedia.org/wiki/Knot_theory Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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