Docker on Ubuntu

This method installs the sources as detailed here.

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

install the key:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

echo \

  "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \

  $(lsb_release -cs) 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

Then run the post install tasks here. Switch to the relevant user then:

sudo groupadd docker
sudo usermod -aG docker $USER
activate new group: newgrp docker or log out/in

Ten test it works as this user: docker run hello-world