How to Install Docker on Linux Ubuntu

1- Update Ubuntu's local database:

sudo apt-get update

2- Download Docker's dependencies:

sudo apt-get install apt-transport-https ca-certificates curl software-properties-common -y

3- Add Docker's GPG key:

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

4- Install Docker's repository:

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu  $(lsb_release -cs)  stable"

5- Update Ubuntu's repositories:

sudo apt-get update

6- Install Docker:

sudo apt-get install docker-ce -y

7- Add your user to the docker group:

sudo usermod -aG docker $USER

8- Log out and log back in so that the changes made take effect:

newgrp docker