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the k3s docker image is distroless; it does not come from any Linux distribution and does not have a package manager. It is just the K3s binaries and a few other busybox utilities, all statically linked. If you could get a statically linked version of the binaries you need, you could

docker cp

them into the image, or build a derivative image with them installed.

If you search around on GPU support with K3D they tend to include copying the K3S binaries from their container into a Ubuntu base image, so the Dockerfile example from that (from the K3D faq) should give you enough info to do the same to a base container of your choice.