Fix ca-certificates errors

openvpn-install.sh

@@ -207,6 +207,7 @@ else
 	echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
 	read -n1 -r -p "Press any key to continue..."
 	if [[ "$OS" = 'debian' ]]; then
+		apt-get install ca-certificates -y
 		# We add the OpenVPN repo to get the latest version.
 		# Debian 7
 		if [[ "$VERSION_ID" = 'VERSION_ID="7"' ]]; then