Comment 1 for bug 2041263

This also happens when trying to refresh a charm in a LXD cloud, like the data platform charms. In that situation, we see the unit in a failed state for some seconds, before the upgrade proceeds.

Following, there are the logs of another call to juju refresh on LXD, with the easyrsa charm, which also gets into a failed state for some seconds before being upgraded.

unit-easyrsa-0: 18:09:52 ERROR juju.worker.uniter resolver loop error: preparing operation "upgrade to ch:amd64/jammy/easyrsa-48" for easyrsa/0: failed to download charm "ch:amd64/jammy/easyrsa-48" from API server: Get https://10.28.44.219:17070/model/db3cad23-9bc3-4762-8939-9e774e0451b1/charms?file=%2A&url=ch%3Aamd64%2Fjammy%2Feasyrsa-48: cannot retrieve charm: ch:amd64/jammy/easyrsa-48
unit-easyrsa-0: 18:09:52 INFO juju.worker.uniter unit "easyrsa/0" shutting down: preparing operation "upgrade to ch:amd64/jammy/easyrsa-48" for easyrsa/0: failed to download charm "ch:amd64/jammy/easyrsa-48" from API server: Get https://10.28.44.219:17070/model/db3cad23-9bc3-4762-8939-9e774e0451b1/charms?file=%2A&url=ch%3Aamd64%2Fjammy%2Feasyrsa-48: cannot retrieve charm: ch:amd64/jammy/easyrsa-48
unit-easyrsa-0: 18:09:52 ERROR juju.worker.dependency "uniter" manifold worker returned unexpected error: preparing operation "upgrade to ch:amd64/jammy/easyrsa-48" for easyrsa/0: failed to download charm "ch:amd64/jammy/easyrsa-48" from API server: Get https://10.28.44.219:17070/model/db3cad23-9bc3-4762-8939-9e774e0451b1/charms?file=%2A&url=ch%3Aamd64%2Fjammy%2Feasyrsa-48: cannot retrieve charm: ch:amd64/jammy/easyrsa-48

It's important to not have this failed status, as it may lead to users think that something is broken in the upgrade process.