/usr/share/xscreensaver/config/truchet.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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="truchet" _label="Truchet">
<command arg="-root"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="1000000" default="400000"
convert="invert"/>
<!-- #### -min-width [40] -->
<!-- #### -max-height [150] -->
<!-- #### -max-width [150] -->
<!-- #### -min-height [40] -->
<!-- #### -max-linewidth [25] -->
<!-- #### -min-linewidth [2] -->
<!-- #### -no-erase -->
<!-- #### -erase-count [25] -->
<!-- #### -not-square -->
<!-- #### -no-angles -->
<!-- #### -no-curves -->
<!-- #### -scroll -->
<!-- #### -scroll-overlap [400] -->
<!-- #### -anim-delay [100] -->
<!-- #### -anim-step-size [3] -->
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<_description>
This draws line- and arc-based truchet patterns that tile the screen.
http://en.wikipedia.org/wiki/Tessellation
Written by Adrian Likins; 1998.
</_description>
</screensaver>
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