Yes. The checksum was wrong. It now matches the one in the virtual box definition (and on the ubuntu shasums.txt)
-s

On October 15, 2013 at 2:09:01 PM, Julian C. Dunn (notifications@github.com) wrote:

In packer/ubuntu-12.04-amd64.json:

> @@ -74,17 +75,15 @@
>        "disk_size": 40960,
>        "guest_os_type": "ubuntu-64",
>        "http_directory": "http",
> -      "iso_checksum": "983cfa31d1a376e0c6d2e431af7e0e5757f8d28a",
> +      "iso_checksum": "4e36c272dde245cfadf14ff8895566571a38f4d2",
Did you mean to change this?

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