How to install Docker on Ubuntu 18.04

1.[user@docker:/#] sudo apt install -y apt-transport-https ca-certificates curl software-properties-common
2.[user@docker:/#] sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
3.[user@docker:/#] sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
4.[user@docker:/#] sudo apt update
5.[user@docker:/#] sudo apt-cache policy docker-ce
6.[user@docker:/#] sudo apt install -y docker-ce
7.[user@docker:/#] sudo systemctl status docker
8.[user@docker:/#] sudo docker -v
9.[user@docker:/#] sudo docker info