https://www.cloudsigma.com/how-to-install-and-use-kubernetes-on-ubuntu-20-04/
https://github.com/justmeandopensource/kubernetes/blob/master/docs/install-cluster-ubuntu-20.md
# Backup old containerd config (optional)
sudo mv /etc/containerd/config.toml /etc/containerd/config.bak
sudo mv /etc/containerd/config.toml /etc/containerd/config.bak
# Regenerate containerd config
sudo containerd config default | sudo tee /etc/containerd/config.toml
sudo containerd config default | sudo tee /etc/containerd/config.toml
# Restart containerd
sudo systemctl restart containerd
sudo systemctl restart containerd