I am trying to install Kubernetes on Ubuntu 20.04 but the latest release is for Ubuntu 16.04. I am following the official tutorial by kubernetes https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/
Is it discontinued for Ubuntu?
As @jordanm and @mdaniel mentioned
likely the upstream disagreements in Debian about vendoring k8s dependencies. Lot of dev discussion about whether or not k8s should even be included in a stable release. OS provided packages are probably the least-common way to provision a cluster.
Related to that, kubernetes binaries are statically linked golang programs, and thus have very little in the way of "dependency upon. Ubuntu whatever" so it's likely fine to just use the 16.04 repo.
Read: minikube-ubuntu-20.04.
See also: kubernetes-on-ubuntu.