Comment 6 for bug 2026651

@Peter Sabaini: changing the source to "quincy" breaks package versioning - "performing upgrade to None" is the status message and the units dont go into an error state. Same silent breakage i describe in the original issue.

Digging into how juju manages "ceph state" is a bit confounding: having a local file on the target system "hold state" does not look very safe; and with all the disparities between sources, channels, and Juju's own behavior over the last couple of years, there's not a lot of confidence in performing these upgrades on prod targets which were using sources that were live 2y ago and have been deprecated and then apparently had the new source superseded without the ability to safely switch between various sources with state awareness.