ubuntu_image=${image_path}/ubuntu-16.04-server-cloudimg-amd64-disk1.img
if [[ ! -f ${ubuntu_image} ]]; then
echo "Download image ubuntu-16.04-server-cloudimg-amd64-disk1.img ..."
ubuntu_image=${image_path}/ubuntu-16.04-server-cloudimg-amd64-disk1.img
if [[ ! -f ${ubuntu_image} ]]; then
echo "Download image ubuntu-16.04-server-cloudimg-amd64-disk1.img ..."