/usr/share/xscreensaver/config/substrate.xml 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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="substrate" _label="Substrate">
<command arg="-root"/>
<hgroup>
<vgroup>
<number id="speed" type="slider" arg="-growth-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="18000" convert="invert"/>
<number id="maxcyc" type="slider" arg="-max-cycles %"
_label="Duration" _low-label="Short" _high-label="Long"
low="2000" high="25000" default="10000" />
<number id="sandg" type="slider" arg="-sand-grains %"
_label="Sand grains" _low-label="Few" _high-label="Lots"
low="16" high="128" default="64" />
<number id="curve" type="slider" arg="-circle-percent %"
_label="Circle percentage" _low-label="0%" _high-label="100%"
low="0" high="100" default="33" />
</vgroup>
<vgroup>
<number id="init" type="spinbutton" arg="-initial-cracks %"
_label="Initial cracks" low="3" high="15" default="3"/>
<boolean id="wire" _label="Wireframe only" arg-set="-wireframe" />
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
</vgroup>
</hgroup>
<_description>
Crystalline lines grow on a computational substrate. A simple
perpendicular growth rule creates intricate city-like structures.
Written by J. Tarbell and Mike Kershaw; 2004.
</_description>
</screensaver>
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