/usr/share/applications/screensavers/metaballs.desktop is in xscreensaver-data 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=MetaBalls
Exec=/usr/lib/xscreensaver/metaballs -root
TryExec=/usr/lib/xscreensaver/metaballs
Comment=Draws two dimensional metaballs: overlapping and merging balls with fuzzy edges. http://en.wikipedia.org/wiki/Metaballs Written by W.P. van Paassen.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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