Write stub on muon with how to software updgrades.

source/4/4.2/muon.rst

@@ -0,0 +1,17 @@
+Chapter 4.2 Muon Package manager
+================================
+
+Muon package manager is an alternative GUI for installing and updating updating packages. 
+
+Useage
+------
+To update your packages press the gear button with a clockwise pointed arrow. If updates are available press the upward pointing arrow with a dot on top to install the updates. 
+
+Version
+-------
+Lubuntu ships with version 4:5.8.0 of muon package manager
+
+How to Launch
+-------------
+To launch muon package manager from the menu -> System Tools -> Muon package manager. 
+

source/4/Installing_Updating_and_Removing_Software.rst

@@ -7,4 +7,5 @@ This chapter will teach you how to use GUI to install update and remove software
   :maxdepth: 2
   :titlesonly:
 
-  4.1/discover 
+  4.1/discover
+  4.2/muon