Comment 1 for bug 1742342

Between filing this bug and 2.8.0, juju has added --agent-stream to upgrade-juju and upgrade-controller.

However there is still an issue. juju is able to verify the version and start the upgrade. Then the upgrade worker uses the model-config agent-stream to download and fails if not also set to proposed.

Side note: if you upgrade to say 2.8.1 proposed, you cannot currently then upgrade to 2.8.1 released. Version checks use the version, not a (version, stream) tuple. In the rare case we spin a new candidate, the user would be left on the first one.