Install Docker – Ubuntu Focal 20.04

Installing Docker on Linux can be tricky. Follow the instructions step by step.

• Distribution: Ubuntu Focal 20.04 (LTS)

Check the Ubuntu release version

lsb_release -d

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Update the apt package

• Update the apt package index and install packages to allow apt to use a repository over HTTPS:

sudo apt-get update

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

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Set up the Docker repositories

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"

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Install Docker packages

sudo apt-get update

sudo apt-get install -y docker-ce docker-ce-cli containerd.io

sudo apt-mark hold docker-ce

Confirm installation of Docker

sudo docker version

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Use Docker as a non-root user

sudo usermod -aG docker <user-name>

docker version

• You need to log out and log in again.

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Run docker

docker run hello-world