Add Correct apt repo to update docker
$ cat /etc/apt/sources.list.d/docker.list
deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable
Reference: https://www.reddit.com/r/pop_os/comments/hdewao/trying_to_install_docker_on_2004_but_getting_an/
$ cat /etc/apt/sources.list.d/virtualbox.list
deb [arch=amd64] https://download.virtualbox.org/virtualbox/debian focal contrib
$ wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
$ wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
$ sudo apt-get update
$ sudo apt-get install virtualbox-6.1
curl -sfL https://get.k3s.io | K3S_KUBECONFIG_MODE="644" sh -s - - server --disable=traefik