Install Docker on an Ubuntu machine

docker-ubuntu.sh

#!/bin/bash

# Install Docker on Ubuntu #
#--------------------------#

# Update packages
sudo apt update

# Install prerequistes
sudo apt install apt-transport-https ca-certificates curl software-properties-common -y

# Add GPG Key for the official Docker repository
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

# Add Docler repo to APT sources
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

# Update packages again
sudo apt update

# Ensure that docker is being installed from Docker and not from Ubuntu
apt-cache policy docker-ce

sleep 2

echo "Is Docker installed from the Docker repo? [y/n]"
read userInput

while true; do
    if [ $userInput == "y" ] || [ $userInput == "Y"]; then
        sudo apt install docker-ce -y
        echo "Docker should now be active..."
        sudo systemctl status docker
    elif [ $userInput == "n"] || [ $userInput == "N" ]; then
        # Some better error handling is needed
        echo "Oh no... :(  Exiting the script so that you can debug"
        break
    else
        echo "Please choose: Y or N"
        continue
    fi
done

clear

echo "Do you want to run Docker without sudo?? [Y/N]"
read sudoYesNo
while true; do
    if [ $sudoYesNo == "y"] || [ $sudoYesNo == "Y" ]; then
        sudo usermod -aG docker ${USER}
        su - ${USER}
        echo "All done. You can now run docker without sudo."
        break
    elif [ $sudoYesNo == "n"] || [ $sudoYesNo == "N" ]; then
        echo "No problem. Enjoy Docker :)"
        break
    else
        echo "Please choose: Y or N"
        continue
    fi
done