Install Docker on Ubuntu LTS

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Run these commands in a terminal (they require sudo).

Update packages

sudo apt update
sudo apt upgrade -y

Install prerequisites

sudo apt install -y ca-certificates curl gnupg lsb-release

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
sudo chmod a+r /etc/apt/keyrings/docker.gpg

Add Docker 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

Install Docker Engine

sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin

Start and enable Docker

sudo systemctl enable --now docker

(Optional) Run Docker as your user

sudo usermod -aG docker $USER
# then log out and log back in (or run:)
newgrp docker

Verify installation

docker --version
docker run --rm hello-world

Notes: These commands follow Docker's recommended APT install process and work on supported Ubuntu LTS releases. Reboot or re-login is required after adding your user to the docker group.