Update ubuntu-installScript

Author: cjy37

ubuntu-installScript

@@ -148,6 +148,8 @@ function updateMono()
 	echo "deb http://download.mono-project.com/repo/debian alpha main" | sudo tee /etc/apt/sources.list.d/mono-xamarin-alpha.list
 	sudo apt-get update
 	sudo apt-get install -y mono-complete
+	sudo apt-get install -y ca-certificates-mono
+	
 	echo "Install mono completed. info:"
 	mono -V
 	echo "------------------------------------"
@@ -179,6 +181,7 @@ function setupNewMono()
 	echo "deb http://download.mono-project.com/repo/debian alpha main" | sudo tee /etc/apt/sources.list.d/mono-xamarin-alpha.list
 	sudo apt-get update
 	sudo apt-get install -y mono-complete
+	sudo apt-get install -y ca-certificates-mono
 
 	echo "Install mono completed. info:"
 	mono -V