/usr/share/applications/screensavers/jigsaw.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=Jigsaw
Exec=/usr/lib/xscreensaver/jigsaw -root
TryExec=/usr/lib/xscreensaver/jigsaw
Comment=This grabs a screen image, carves it up into a jigsaw puzzle, shuffles it, and then solves the puzzle. This works especially well when you feed it an external video signal instead of letting it grab the screen image (actually, I guess this is generally true...) When it is grabbing a video image, it is sometimes pretty hard to guess what the image is going to look like once the puzzle is solved. Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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