A Step-by-Step Guide to Installing Docker on Ubuntu 20.04

To install Docker on Ubuntu 20.04, you can use the following steps:

1. Update the package index:

Copy codesudo apt update

2. Install the packages to allow apt to use a repository over HTTPS:

Copy codesudo apt install apt-transport-https ca-certificates curl software-properties-common

3. Add the Docker official GPG key:

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

4. Verify the fingerprint of the key:

Copy codesudo apt-key fingerprint 0EBFCD88

5. Add the Docker repository to your system:

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

6. Update the package index again:

Copy codesudo apt update

7. Install Docker CE:

Copy codesudo apt install docker-ce

8. Start the Docker service and enable it to start at boot:

Copy codesudo systemctl start docker
sudo systemctl enable docker

You can verify that Docker is working by running the following command:

Copy codedocker run hello-world

You can also add user to the docker group

Copy codesudo usermod -aG docker $USER

and logout or restart the session to take effect the permission.