install docker on Ubuntu. This will require `sudo` to run `docker`. To run without `sudo`, see `no-sudo.md` for directions

install_docker_ubuntu.sh

sudo apt update --yes
sudo apt upgrade --yes

sudo apt install --yes \
  curl \
  apt-transport-https \
  ca-certificates \
  software-properties-common

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 update --yes

apt-cache policy docker-ce

sudo apt install --yes docker-ce

sudo systemctl status docker

no-sudo.md

To make docker runnable without sudo:

sudo usermod -aG docker ${USER}

su - ${USER}

exec $SHELL