{
  "name": "ubuntu12",
  "description": "Ubuntu 12.04 LTS",
  "providermap": {
    "joyent": {
      "image": "d2ba0f30-bbe8-11e2-a9a2-6bc116856d85"
    },
    "rackspace": {
      "image": "ffa476b1-9b14-46bd-99a8-862d1d94eb7a"
    }
  }
}

{
  "name": "ubuntu12",
  "description": "Ubuntu 12.04 LTS",
  "providermap": {
    "joyent": {
      "image": "f21af273-353f-4020-8ae1-3ac34481c7b4"
    },
    "rackspace": {
      "image": "ffa476b1-9b14-46bd-99a8-862d1d94eb7a"
    }
  }
}

Use certified Ubuntu image, instead.
Use certified Ubuntu image, instead.
