/usr/share/help/gl/system-admin-guide/desktop-shield.page is in gnome-user-docs-gl 3.28.1-0ubuntu1.
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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-shield" xml:lang="gl">
<info>
<link type="guide" xref="appearance"/>
<revision pkgversion="3.22" date="2017-01-09" status="draft"/>
<credit type="author copyright">
<name>Matthias Clasen</name>
<email its:translate="no">matthias.clasen@gmail.com</email>
<years>2012</years>
</credit>
<credit type="author copyright">
<name>Michael Hill</name>
<email its:translate="no">mdhillca@gmail.com</email>
<years>2012</years>
</credit>
<credit type="editor">
<name>Jana Svarova</name>
<email its:translate="no">jana.svarova@gmail.com</email>
<years>2013</years>
</credit>
<credit type="editor">
<name>Petr Kovar</name>
<email its:translate="no">pknbe@volny.cz</email>
<years>2017</years>
</credit>
<include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>
<desc>Cambiar o fondo da pantalla de bloqueo.</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>Cambiar a pantalla de bloqueo</title>
<p>The <em>lock screen shield</em> is the screen that quickly slides down when
the system is locked. The background of the lock screen shield is controlled by
the <sys>org.gnome.desktop.screensaver.picture-uri</sys> GSettings key. Since
<sys>GDM</sys> uses its own <sys>dconf</sys> profile, you can set the default
background by changing the settings in that profile.</p>
<steps>
<title>Estabelecer a chave org.gnome.desktop.screensaver.picture-uri</title>
<include xmlns="http://www.w3.org/2001/XInclude" href="dconf-snippets.xml" xpointer="xpointer(/*/*[@xml:id='dconf-profile-gdm'])"/>
<item><p>Cree unha base de datos <sys>gdm</sys> para as preferencias a nivel de maquina en <file>/etc/dconf/db/gdm.d/<var>01-protector de pantalla</var></file>:</p>
<code>[org/gnome/desktop/screensaver]
picture-uri='file://<var>/opt/corp/background.jpg</var>'</code>
<p>Substitúa <var>/opt/corp/background.jpg</var> coa ruta ao ficheiro de imaxe que qeure usar como fondo da pantalla de bloqueo.</p>
<p>Os formatos admitidos son PNG, JPG, JPEG e TGA. A imaxe será escalada se é reciso para axustarse á pantalla.</p>
</item>
<include xmlns="http://www.w3.org/2001/XInclude" href="dconf-snippets.xml" xpointer="xpointer(/*/*[@xml:id='dconf-update'])"/>
<item><p>Debe pechar a sesión antes de que os cambio a nivel de sistema se apliquen.</p>
</item>
</steps>
<p>A seguinte vez que bloquee a pantalla, a nova pantalla de bloqueo mostrará o fondo. Por diante mostrarase a hora, data e o día da semana actual.</p>
<section id="troubleshooting-background">
<title>Que pasa se o fondo non se actualiza?</title>
<p>Asegúrese que executa a orde <cmd its:translate="no">dconf update</cmd> para actualizar as bases de datos do sistema.</p>
<p>No caso que o fondo de pantalla non se actualice, tente reiniciar <sys>GDM</sys>.</p>
</section>
</page>
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