/usr/share/applications/screensavers/cube21.desktop is in xscreensaver-gl-extra 5.34-2ubuntu1.
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=Cube21
Exec=/usr/lib/xscreensaver/cube21 -root
TryExec=/usr/lib/xscreensaver/cube21
Comment=Animates a Rubik-like puzzle known as Cube 21 or Square-1. The rotations are chosen randomly. See also the "Rubik" and "GLSnake" screen savers. http://en.wikipedia.org/wiki/Square_One_%28puzzle%29 Written by Vasek Potocek.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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