/usr/share/help/C/system-admin-guide/login-banner.page is in gnome-user-docs 3.28.1-0ubuntu1.
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xmlns:its="http://www.w3.org/2005/11/its"
type="topic" style="task"
id="login-banner">
<info>
<link type="guide" xref="login#appearance"/>
<!--<link type="seealso" xref="gdm-restart"/>-->
<revision pkgversion="3.8" date="2013-04-19" status="review"/>
<revision pkgversion="3.14" date="2014-06-17" status="review"/>
<credit type="author copyright">
<name>Matthias Clasen</name>
<email>matthias.clasen@gmail.com</email>
<years>2012</years>
</credit>
<credit type="author copyright">
<name>Michael Hill</name>
<email>mdhillca@gmail.com</email>
<years>2012</years>
</credit>
<credit type="editor">
<name>Jana Svarova</name>
<email>jana.svarova@gmail.com</email>
<years>2013</years>
</credit>
<credit type="author copyright editor">
<name>Ekaterina Gerasimova</name>
<email>kittykat3756@gmail.com</email>
<years>2013</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>Show extra text on the login screen.</desc>
</info>
<title>Display a text banner on the login screen</title>
<comment>
<cite date="2012-11-07" href="mailto:mdhillca@gmail.com">Michael Hill</cite>
<p>Adapted from l-g-o SysAdminGuide page.</p>
</comment>
<p>You can display extra text on the login screen, such as who to contact for
support, by setting the
<sys>org.gnome.login-screen.banner-message-enable</sys> and
<sys>org.gnome.login-screen.banner-message-text</sys> GSettings keys.</p>
<steps>
<title>Display a text banner on the login screen:</title>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-profile-gdm'])"
xmlns="http://www.w3.org/2001/XInclude"/>
<item><p>Create a <sys>gdm</sys> keyfile for machine-wide settings in
<file its:translate="no">/etc/dconf/db/gdm.d/01-banner-message</file>:</p>
<code its:translate="no">[org/gnome/login-screen]
banner-message-enable=true
banner-message-text='<input its:translate="yes">Type the banner message here.</input>'
</code>
</item>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-update'])"
xmlns="http://www.w3.org/2001/XInclude"/>
</steps>
<note>
<p>You should keep the banner message short, as longer messages do
not fit on the screen. The banner message cannot be read from
an external file.</p>
</note>
</page>
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