Merge lp:~paelzer/serverguide/serverguide-16.04-do-release-upgrade into lp:serverguide/trunk

[Christian Ehrhardt ]

clarify do-release-update details that are slightly special for an LTS release

We realized today that many know how the do-release-upgrade is special for LTS, but it is not properly documented other than a few ask Ubuntu posts.

This change is meant to clarify that in at least one of our docs (not sure if more should get that info).

[Doug Smythies (dsmythies)]

O.K. Thanks very much

review: Approve

=== modified file 'serverguide/C/installation.xml'
--- serverguide/C/installation.xml	2016-04-12 15:05:41 +0000
+++ serverguide/C/installation.xml	2016-05-05 14:48:11 +0000
@@ -407,6 +407,12 @@
 	  Upgrading to a development release is <emphasis>not</emphasis> recommended for production environments.
 	  </para>
 	</warning>
+	<para>
+		For further stability of a LTS release there is a slight change in behaviour if you are currently running a LTS version.
+		LTS systems are only automatically considered for an upgrade to the next LTS via <application>do-release-upgrade</application> with the first point release.
+		So for example 14.04 will only upgrade once 16.04.1 is released.
+		If you want to update before, e.g. on a subset of machines to evaluate the LTS upgrade for your setup the same argument as an upgrade to a dev release has to be used via the <emphasis>-d</emphasis> switch.
+	</para>
       </sect2>
     </sect1>
     <sect1 id="advanced-installation" status="review">