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/usr/share/xscreensaver/config/companioncube.xml is in xscreensaver-gl-extra 5.34-2ubuntu1.

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The actual contents of the file can be viewed below.

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

<screensaver name="companioncube" _label="CompanionCube" gl="yes">

  <command arg="-root"/>

  <video href="http://www.youtube.com/watch?v=Q54NVuxhGso"/>

  <hgroup>
   <vgroup>

    <number id="delay" type="slider" arg="-delay %"
            _label="Frame rate" _low-label="Low" _high-label="High"
            low="0" high="100000" default="30000"
            convert="invert"/>

    <number id="speed" type="slider" arg="-speed %"
            _label="Bounce" _low-label="Slow" _high-label="Fast"
            low="0.05" high="2.0" default="1.0"/>

   </vgroup>
   <vgroup>

    <number id="count" type="slider" arg="-count %"
            _label="Number of cubes" _low-label="1" _high-label="20"
            low="1" high="20" default="3"/>

    <hgroup>
     <vgroup>
      <boolean id="spin"    _label="Spin"            arg-set="-spin"/>
      <boolean id="wander"  _label="Wander"          arg-set="-wander"/>
     </vgroup>
     <vgroup>
      <boolean id="wire"    _label="Wireframe"       arg-set="-wireframe"/>
      <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
     </vgroup>
    </hgroup>

   </vgroup>
  </hgroup>

  <xscreensaver-updater />

  <_description>
The symptoms most commonly produced by Enrichment Center testing are
superstition, perceiving inanimate objects as alive, and hallucinations.
The Enrichment Center reminds you that the weighted companion cube will
never threaten to stab you and, in fact, cannot speak.  In the event that
the Weighted Companion Cube does speak, the Enrichment Center urges you to
disregard its advice.

https://en.wikipedia.org/wiki/Portal_%28video_game%29

Written by Jamie Zawinski; 2011.
  </_description>
</screensaver>