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Is this comment applicable? https://github.com/rancher-sandbox/rancher-desktop/issues/6959#issuecomment-2136353247 Is there another way around this if so?

^ yes that is applicable. Once rd is up, you can shell into the vm, add the registry with a script and restart k3s service. That should get it working.

I installed k3s on a new Ubuntu machine, updated the file /etc/rancher/k3s/registries.yaml, and restarted k3s with service k3s restart. The kubectl run pulls the image fine in that case. When I repeat this on rancher desktop on my mac (after a factory reset, and selecting the Docker CE) using

rdctl shell

then more or less repeat the same procedure, the image pull continues to fail.