guide linking to wrong pages fix
diff --git a/user_guide/overview/at_a_glance.html b/user_guide/overview/at_a_glance.html
index a4d0f36..6dc9287 100644
--- a/user_guide/overview/at_a_glance.html
+++ b/user_guide/overview/at_a_glance.html
@@ -159,7 +159,7 @@
<div id="footer">
<p>
-Previous Topic: <a href="../installation/upgrading.html">Upgrading from an Older Version</a>
+Previous Topic: <a href="../installation/troubleshooting.html">Trouble Shooting</a>
·
<a href="#top">Top of Page</a> ·
<a href="../index.html">User Guide Home</a> ·