SHA256(ubuntu-ova.ovf)= 1bbc997ba8dc3659bbc9ecf5e49f57f4adb502eda113864533d9dc2e64e000f8
SHA256(ubuntu-ova-disk1.vmdk)= 7912115e9d93883d14b001264f821433ac8c5efaac1566d7aee79787ca25d886