/usr/share/applications/screensavers/julia.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=Julia
Exec=/usr/lib/xscreensaver/julia -root
TryExec=/usr/lib/xscreensaver/julia
Comment=Animates the Julia set (a close relative of the Mandelbrot set). The small moving dot indicates the control point from which the rest of the image was generated. See also the "Discrete" screen saver. http://en.wikipedia.org/wiki/Julia_set Written by Sean McCullough.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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