This scrip is useful to install docker on ubuntu 20.04 LTS.

install-docker.sh

#!/bin/sh
# It would be outdated after a while
# This file created at 2023.04.03 by Salih KARAHAN <salihkarahan@outlook.com>

# Install docker (follow steps at the link https://docs.docker.com/engine/install/ubuntu/)

sudo apt-get update && sudo apt-get -y upgrade

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

sudo mkdir -m 0755 -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

echo \
  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt-get update

sudo chmod a+r /etc/apt/keyrings/docker.gpg
sudo apt-get update

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

# update docker compose plugin manually
# https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-compose-on-ubuntu-22-04

mkdir -p ~/.docker/cli-plugins/

# https://github.com/docker/compose/releases
curl -SL https://github.com/docker/compose/releases/download/v2.17.2/docker-compose-linux-x86_64 -o ~/.docker/cli-plugins/docker-compose

sudo chmod 666 /var/run/docker.sock