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I am aware of the more generic version of this question, found here:

Why is some software not in the official Ubuntu repositories?

However, I would like to ask about Kubernetes in particular.

I am wonder why some very popular package does not add in official Ubuntu repo? is there any way to add this to official repo?

For example I found kubectl in Debian repo but I do not know why found this in universe?

sorosh_sabz
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    The Golang ecosystem is not very friendly to Debian/Red Hat packaging, and for complex systems like k8s with rapid release cycles (multiple times a year) being frozen into an LTS system like Ubuntu or Debian really doesn't make sense. Most people using K8s wouldn't want that. Put simply, there's no actual market, aside from the random hobbyist. – muru Jul 13 '23 at 12:30

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You can install the kubectl snap package in all currently supported versions of Ubuntu by running the following command:

sudo snap install microk8s --classic
sudo snap install kubectl --classic
sudo snap install kubelet --classic
sudo snap install kubeadm --classic

snap packages are available for all versions of kubectl from 1.5 to 1.28. Dozens of other kubernetes snap packages are also available. To list them all run snap find kubernetes .

karel
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  • Why we cannot use apt install ? – sorosh_sabz Jul 13 '23 at 12:23
  • I believe kubectl isn't actually Kubernetes itself, but only a management interface. Whereas microk8s is a single-node Kubernetes instance. – Artur Meinild Jul 13 '23 at 12:23
  • But I need kubeadm, kubectl, kubelet, ... package separately in Debian form, for installing large scale Kubernetes in ubuntu servers – sorosh_sabz Jul 19 '23 at 20:13
  • kubeadm, kubectl, and kubelet are all packaged as snap packages in Ubuntu. I revised my answer accordingly. – karel Jul 20 '23 at 05:37
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    @karel Ok, My question is why Ubuntu does not provide these packages in debian form? – sorosh_sabz Jul 20 '23 at 11:18
  • Because Kubernetes is being aggressively developed most users prefer to install recent versions. apt doesn't update as aggressively as snap, so packages with a fast update schedule like Firefox are packaged as snap packages in Ubuntu. That's good for Ubuntu users like me who sometimes need the latest version of a software. – karel Jul 20 '23 at 11:24