Comment 4 for bug 1259180

Took a while, but I reproduced again on Azure with Juju modified to not destroy the instance. /var/log/cloud-init-output.log has this at the end: http://paste.ubuntu.com/6549372/

Of particular note are the first and last lines. I can't confirm whether it's the same thing on ec2, as I can't reproduce there. Will dig into this error.