sudo apt update
sudo apt install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable"
apt-cache policy docker-ce
sudo apt install docker-ce

sudo systemctl status docker

 sudo usermod -aG docker $USER

docker pull alpine
docker images
docker run -it alpine
docker ps -a
docker ps -l  # latest
docker stop container_name