$ sudo apt-get update
$ sudo apt-get install awn-applet-volume-control 

awn-applet-volume-control is installed in your system.

Make ensure the awn-applet-volume-control package were installed using the commands given below,

$ sudo dpkg-query -l | grep awn-applet-volume-control *

You will get with awn-applet-volume-control package name, version, architecture and description in a table

awn-applet-volume-control package basic information: