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/usr/share/xscreensaver/config/hopalong.xml 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.

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

<screensaver name="hopalong" _label="Hopalong">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=Ck0pKMflau0"/>

  <hgroup>
   <vgroup>
    <number id="delay" type="slider" arg="-delay %"
            _label="Frame rate" _low-label="Low" _high-label="High"
            low="0" high="100000" default="10000"
            convert="invert"/>

    <number id="cycles" type="slider" arg="-cycles %"
             _label="Duration" _low-label="Small" _high-label="Large"
            low="0" high="800000" default="2500"/>
   </vgroup>

   <vgroup>
    <number id="count" type="slider" arg="-count %"
            _label="Color contrast" _low-label="Low" _high-label="High"
            low="100" high="10000" default="1000"/>

    <number id="ncolors" type="slider" arg="-ncolors %"
              _label="Number of colors" _low-label="Two" _high-label="Many"
              low="1" high="255" default="200"/>
   </vgroup>
  </hgroup>

  <hgroup>
    <vgroup>
      <boolean id="sine"    _label="Sine"    arg-set="-sine"/>
      <boolean id="martin"  _label="Martin"  arg-set="-martin"/>
      <boolean id="popcorn" _label="Popcorn" arg-set="-popcorn"/>
    </vgroup>
    <vgroup>
      <boolean id="jong"    _label="Jong"    arg-set="-jong"/>
      <boolean id="rr"      _label="RR"      arg-set="-rr"/>
      <boolean id="ejk1"    _label="EJK1"    arg-set="-ejk1"/>
    </vgroup>
    <vgroup>
      <boolean id="ejk2"    _label="EJK2"    arg-set="-ejk2"/>
      <boolean id="ejk3"    _label="EJK3"    arg-set="-ejk3"/>
      <boolean id="ejk4"    _label="EJK4"    arg-set="-ejk4"/>
    </vgroup>
    <vgroup>
      <boolean id="ejk5"    _label="EJK5"    arg-set="-ejk5"/>
      <boolean id="ejk6"    _label="EJK6"    arg-set="-ejk6"/>
      <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
    </vgroup>
  </hgroup>

  <xscreensaver-updater />

  <_description>
Lacy fractal patterns based on iteration in the imaginary
plane, from a 1986 Scientific American article.  See also the
"Discrete" screen saver.

Written by Patrick Naughton; 1992.
  </_description>
</screensaver>