Install Docker Engine on Ubuntu

# Add Docker's official GPG key:
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL <https://download.docker.com/linux/ubuntu/gpg> -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \\
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] <https://download.docker.com/linux/ubuntu> \\
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \\
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-
plugin docker-compose-plugin

sudo docker run hello-world

# Add users to the docker group : 
sudo usermod -aG docker <user_name>

sudo reboot

1. Check if the user can run docker containers without needing sudo : (after logging into the user account) docker run hello-world