Comment 1 for bug 1931116

> Perhaps a conflict of primary and subordinate charms installing packages at the same time?

In theory this can't (shouldn't!?) happen as the juju agent for the machine is supposed to serialise hooks on a machine, so that a subordinate hook "can't" be running at the same time as a principle hook. At least it used to be this way?

I wondered if this was unattended upgrades getting in the way, but maybe that's a red-herring.