Comment 2 for bug 1685399

I'm doing (2). The MAAS images contain cached apt lists from when the images were built in /var/cache/apt. If the mirror is behind, the apt-get update and/or upgrade will fail because the image expects newer apt lists/hashes than are present on the mirror, and doesn't overwrite the newer lists with the older lists.

This might be something that should be fixed in cloud-init rather than MAAS; I just wanted to start the discussion here.