/usr/share/applications/screensavers/spotlight.desktop is in xscreensaver-data-extra 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=Spotlight
Exec=/usr/lib/xscreensaver/spotlight -root
TryExec=/usr/lib/xscreensaver/spotlight
Comment=Draws a spotlight scanning across a black screen, illuminating the underlying desktop (or a picture) when it passes. Written by Rick Schultz and Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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