Comment 2 for bug 1778614

Sounds like the unit agents didn't come back after restarting after the upgrade. Is there any log details around the time of upgrade for the controller or unit logs that might provide any about why they did not come up?

When you juju run with a unit target it will need to speak to the unit agent where as if you target the machine a different agent (which seems like it was back up and responsive) handles the request.