How to install docker on ubuntu?

Docker installing on Ubuntu

1) Update package manager and add docker repository

sudo apt-get update

sudo apt-get 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 $(lsb_release -cs) stable"

2) Update again and install docker-ce

sudo apt-get update
sudo apt-get install docker-ce