install-docker-focal.sh

 #!/bin/sh
 
 sudo apt-get -y remove docker docker-engine docker.io runc
 
 sudo apt-get update
 
 sudo apt-get -y install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg

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

echo \
  "deb [arch=amd64 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 -y install docker-ce docker-ce-cli containerd.io

usage:

wget -q https://gist.githubusercontent.com/derjohn/22b83ba41269da6b55206b71aa2b1601/raw/47fa6357785c875e1d0b21095bbc6dd2d0424748/install-docker-focal.sh -O - | sh