This file is indexed.

/usr/share/xscreensaver/config/cubicgrid.xml 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.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="cubicgrid" _label="CubicGrid">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
    _label="Frame rate" _low-label="Low" _high-label="High"
    low="0" high="100000" default="20000" convert="invert"/>

  <number id="speed" type="slider" arg="-speed %"
    _label="Speed" _low-label="Slow" _high-label="Fast"
    low="0.2" high="10.0" default="1.0"/>

  <number id="zoom" type="slider" arg="-zoom %"
    _label="Dot spacing" _low-label="Close" _high-label="Far"
    low="15" high="100" default="20"/>  

  <boolean id="bigdots" _label="Big dots"            arg-unset="-no-bigdots"/>
  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <_description>
Draws the view of an observer located inside a rotating 3D lattice of colored 
points.

Written by Vasek Potocek; 2007.
  </_description>
</screensaver>