how install docker in ubuntu code example

Example 1: how to install docker ubuntu

sudo apt-get update
sudo apt-get upgrade
sudo apt install docker.io
systemctl start docker
systemctl enable docker
docker --version

Example 2: how to install docker on ubuntu

sudo apt install docker.io

Example 3: docker engine install ubuntu

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -