Comment 5 for bug 1367987

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Ian Booth (wallyworld) wrote : Re: juju 1.18 cannot parse simplestreams containing version "1.21-alpha1"

@Robie, any time we need to release an alpha, beta, rc version of Juju, 1.18 installs will not be able to upgrade even to 1.20 as they do read and parse all the metadata and will fall over. Even if 1.22 were in trusty, there may be folks who choose not to upgrade to that version and are still on 1.18. Then when we add 1.23-beta1, they 1.18 people will still be stuck.

The best approach to not break 1.18 Juju is to start using a v2 streams path going forward, and not publishing anything past 1.20 to the v1 path.