New answers tagged amazon-ec2
They are kind of released. If you look at: https://cloud-images.ubuntu.com/query/xenial/server/released.current.txt you will find the AMI id's. As of right now though, they are not public, atleast not in eu-west-1. Most likely Amazon is vetting them, because they'll become official images.
Most likely, you ran into a race condition with cloud-init. This packer issue gives some insights, and I have tried the following suggestion given by the OP with success: echo "waiting 180 seconds for cloud-init to update /etc/apt/sources.list" timeout 180 /bin/bash -c \ 'until stat /var/lib/cloud/instance/boot-finished 2>/dev/null; do echo waiting ...
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