/usr/share/applications/screensavers/squiral.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=Squiral
Exec=/usr/lib/xscreensaver/squiral -root
TryExec=/usr/lib/xscreensaver/squiral
Comment=Draws a set of interacting, square-spiral-producing automata. The spirals grow outward until they hit something, then they go around it. Written by Jeff Epler.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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