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It’ll help if you run the journalctl cmd mentioned in the screenshot and also if you state what OS is involved and the version of OS. And other interesting things. E.g. what type of K3s cluster you’re configuring. Highly-available control-plane and so on and on. Thanks

Hey, I've managed to kinda solve the problem 😅, I was thinking that I need to have k3s to use rancher manager, but that's not the case, so all good for now.

You can use the standalone rancher docker image, but it's not supported for anything other than just very basic dev use.