I'm pretty sure that Juju used todo a update/upgrade as part of the installation process; can you see in the logs for the unit whether this is the case?
As all of this is coming from the main Ubuntu archive the message:
WARNING: The following packages cannot be authenticated!
I'm pretty sure that Juju used todo a update/upgrade as part of the installation process; can you see in the logs for the unit whether this is the case?
As all of this is coming from the main Ubuntu archive the message:
WARNING: The following packages cannot be authenticated!
is a bit concerning :-)