/usr/share/help/C/system-admin-guide/login-fingerprint.page is in gnome-user-docs 3.28.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
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xmlns:its="http://www.w3.org/2005/11/its"
type="topic" style="task"
id="login-fingerprint">
<info>
<link type="guide" xref="login#management" />
<link type="seealso" xref="dconf" />
<revision pkgversion="3.12" date="2014-06-17" status="candidate" />
<credit type="author copyright">
<name>Ekaterina Gerasimova</name>
<email>kittykat3756@gmail.com</email>
<years>2014</years>
</credit>
<credit type="editor">
<name>David King</name>
<email>davidk@gnome.org</email>
<years>2014</years>
</credit>
<include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
<desc>Prevent the user from being able to log in using a fingerprint
scanner.</desc>
</info>
<title>Disallow login using a fingerprint</title>
<p>Users with a fingerprint scanner can use their fingerprints
instead of a password to log in. Fingerprint login
<link href="help:gnome-help#session-fingerprint">needs to be set up by the
user</link> before it can be used.</p>
<p>Fingerprint readers are not always reliable, so you may wish to disable
login using the reader for security reasons.</p>
<steps>
<title>Disable login using a fingerprint reader:</title>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-profile-user'])"
xmlns="http://www.w3.org/2001/XInclude"/>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-profile-user-dir'])"
xmlns="http://www.w3.org/2001/XInclude"/>
<item>
<p>Create the key file
<file>/etc/dconf/db/local.d/00-login</file> to provide
information for the <sys>local</sys> database.</p>
<listing>
<title><file>/etc/dconf/db/local.d/00-login</file></title>
<code>
# Specify the dconf path
[org/gnome/login-screen]
# Disable fingerprint reader
enable-fingerprint-authentication=false
</code>
</listing>
</item>
<item>
<p>To prevent the user from overriding these settings, create the file
<file>/etc/dconf/db/local.d/locks/login</file> with the following
content:</p>
<listing>
<title><file>/etc/dconf/db/local.d/locks/fingerprintreader</file></title>
<code>
# List the keys used to configure login
/org/gnome/login-screen/enable-fingerprint-authentication
</code>
</listing>
</item>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-update'])"
xmlns="http://www.w3.org/2001/XInclude"/>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-logoutin'])"
xmlns="http://www.w3.org/2001/XInclude"/>
</steps>
</page>
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