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/usr/share/help/C/system-admin-guide/login.page is in gnome-user-docs 3.28.1-0ubuntu1.

This file is owned by root:root, with mode 0o644.

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<page xmlns="http://projectmallard.org/1.0/"
      type="guide"
      id="login">
  <info>
    <link type="guide" xref="index"/>

    <include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
  </info>

  <title>Login</title>

<section id="appearance">
  <title>Appearance</title>
  <links style="2column" type="topic"/>
</section>

<section id="management">
  <title>Management</title>
  <links style="2column" type="topic"/>
</section>
</page>