IIRC, it was possible to write a

<http://upgrade.cattle.io/v1|upgrade.cattle.io/v1>

plan, for Ubuntu packages upgrades. I think at least I once saw an example of that, but my search fu is lacking. Any known pointers to such a thing?

In the SUC readme / examples? https://github.com/rancher/system-upgrade-controller#example-plans

Aaah, thx, I was always ending up on the k3s-upgrade image, now I see that's a separate thing from what I was looking for.