/usr/share/applications/screensavers/bubble3d.desktop is in xscreensaver-gl-extra 5.15-3ubuntu1.
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=Bubble3D
Exec=/usr/lib/xscreensaver/bubble3d -root
TryExec=/usr/lib/xscreensaver/bubble3d
Comment=Draws a stream of rising, undulating 3D bubbles, rising toward the top of the screen, with transparency and specular reflections. Written by Richard Jones.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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