Force ignition to use version 5 (edifice) which is what it is built for so it doesn't default to a newer version

Tools/sitl_run.sh

@@ -192,7 +192,7 @@ elif [ "$program" == "ignition" ] && [ -z "$no_sim" ]; then
 		ignition_headless=""
 	fi
 	source "$src_path/Tools/setup_ignition.bash" "${src_path}" "${build_path}"
-	ign gazebo ${verbose} ${ignition_headless} -r "${src_path}/Tools/simulation-ignition/worlds/${model}.world"&
+	ign gazebo --force-version 5 ${verbose} ${ignition_headless} -r "${src_path}/Tools/simulation-ignition/worlds/${model}.world"&
 elif [ "$program" == "flightgear" ] && [ -z "$no_sim" ]; then
 	echo "FG setup"
 	cd "${src_path}/Tools/flightgear_bridge/"