Straight-forward steps to installing docker on an Ubuntu machine

Step 1: Uninstall Old Versions

sudo apt-get remove docker docker-engine http://docker.io containerd runc

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Step 2: Update apt package and install dependencies

sudo apt-get update

 sudo apt-get install \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

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Step 3: Add Docker's official GPG key

sudo mkdir -p /etc/apt/keyrings

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

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Step 4: Setup the repository

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

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Step 5: Install Docker Engine

sudo apt-get update

sudo apt-get install docker-ce docker-ce-cli http://containerd.io docker-compose-plugin

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Step 6: Test the Installation

sudo service docker start

sudo docker run hello-world

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Step 7: Add your user to the Docker group

sudo usermod -aG docker $USER

PS: when you log out and back in, you should be able to run docker commands without sudo

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Now Docker has been successfully installed on your Ubuntu system 🍻