/usr/share/applications/screensavers/slidescreen.desktop is in xscreensaver-data 5.36-1ubuntu1.
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=SlideScreen
Exec=/usr/lib/xscreensaver/slidescreen -root
TryExec=/usr/lib/xscreensaver/slidescreen
Comment=This takes an image, divides it into a grid, and then randomly shuffles the squares around as if it was one of those "fifteen-puzzle" games where there is a grid of squares, one of which is missing. http://en.wikipedia.org/wiki/Fifteen_puzzle Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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