/usr/share/applications/screensavers/bouboule.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.
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Name=Bouboule
Exec=/usr/lib/xscreensaver/bouboule -root
TryExec=/usr/lib/xscreensaver/bouboule
Comment=This draws what looks like a spinning, deforming balloon with varying-sized spots painted on its invisible surface. Written by Jeremie Petit.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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