/usr/share/applications/screensavers/queens.desktop is in xscreensaver-gl-extra 5.15-3ubuntu1.
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=Queens
Exec=/usr/lib/xscreensaver/queens -root
TryExec=/usr/lib/xscreensaver/queens
Comment=Solves the N-Queens problem (where N is between 5 and 10 queens). The problem is: how may one place N queens on an NxN chessboard such that no queen can attack a sister? See also the "Endgame" screen saver. http://en.wikipedia.org/wiki/Eight_queens_puzzle Written by Blair Tennessy.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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