/usr/share/help/gl/system-admin-guide/desktop-lockscreen.page is in gnome-user-docs-gl 3.28.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" style="task" id="desktop-lockscreen" xml:lang="gl">
<info>
<link type="guide" xref="appearance"/>
<link type="seealso" xref="dconf-profiles"/>
<link type="seealso" xref="dconf-lockdown"/>
<revision pkgversion="3.8" date="2013-08-08" status="review"/>
<revision pkgversion="3.14" date="2014-06-18" status="final"/>
<credit type="author copyright">
<name>Jana Svarova</name>
<email>jana.svarova@gmail.com</email>
<years>2013</years>
</credit>
<credit type="editor">
<name>Shaun McCance</name>
<email>shaunm@gnome.org</email>
<years>2014</years>
</credit>
<desc>Facer que a pantalla se bloquee automaticamente polo que o usuario debe introducir o seu contrasinal despois de estar en repouso.</desc>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Fran Diéguez</mal:name>
<mal:email>frandieguez@gnome.org</mal:email>
<mal:years>2010-2018</mal:years>
</mal:credit>
</info>
<title>Bloquear a pantalla cando o usuario está en repouso</title>
<p>You can make the screen lock automatically whenever a user
is idle for some amount of time. This is useful if your users
may leave their computers unattended in public or unsecure
locations.</p>
<steps>
<title>Activar a pantalla de bloqueo automática</title>
<include xmlns="http://www.w3.org/2001/XInclude" href="dconf-snippets.xml" xpointer="xpointer(/*/*[@xml:id='dconf-profile-user'])"/>
<include xmlns="http://www.w3.org/2001/XInclude" href="dconf-snippets.xml" xpointer="xpointer(/*/*[@xml:id='dconf-profile-user-dir'])"/>
<item>
<p>Create the key file
<file>/etc/dconf/db/local.d/00-screensaver</file> to provide
information for the <sys>local</sys> database.</p>
<listing>
<title><file>/etc/dconf/db/local.d/00-screensaver</file></title>
<code>
# Specify the dconf path
[org/gnome/desktop/session]
# Number of seconds of inactivity before the screen goes blank
idle-delay=uint32 180
# Specify the dconf path
[org/gnome/desktop/screensaver]
# Lock the screen after the screen is blank
lock-enabled=true
# Number of seconds after the screen is blank before locking the screen
lock-delay=uint32 0
</code>
</listing>
<p>You must include the <code>uint32</code> along with the
integer key values as shown.</p>
</item>
<item>
<p>To prevent the user from overriding these settings, create the file
<file>/etc/dconf/db/local.d/locks/screensaver</file> with the following
content:</p>
<listing>
<title><file>/etc/dconf/db/local.db/locks/screensaver</file></title>
<code>
# Bloquear as preferencias do salvapantallas do escritorio
/org/gnome/desktop/session/idle-delay
/org/gnome/desktop/screensaver/lock-enabled
/org/gnome/desktop/screensaver/lock-delay
</code>
</listing>
</item>
<include xmlns="http://www.w3.org/2001/XInclude" href="dconf-snippets.xml" xpointer="xpointer(/*/*[@xml:id='dconf-update'])"/>
<include xmlns="http://www.w3.org/2001/XInclude" href="dconf-snippets.xml" xpointer="xpointer(/*/*[@xml:id='dconf-logoutin'])"/>
</steps>
</page>
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