diff --git a/Guide-GroundSystem.txt b/Guide-GroundSystem.txt
index 692c9f1..faeda33 100644
--- a/Guide-GroundSystem.txt
+++ b/Guide-GroundSystem.txt
@@ -26,6 +26,7 @@ Before launching the Ground System make sure that:
 Installing and running cFS Ground System on Ubuntu:
     $ sudo apt-get install python3-pyqt4
     $ sudo apt-get install python3-zmq
+    $ sudo apt-get install libcanberra-gtk-module
     $ ( cd Subsystems/cmdUtil/ && make )
     $ python3 GroundSystem.py