Install Docker with get-docker script in 4 steps - after you logged in linux console (in my case ubuntu 20.04)
1. install curl package
$ sudo apt install curl -y
2. curl get-docker script
$ curl -fsSL https://get.docker.com -o get-docker.sh
3. execute get-docker script
$ sudo sh get-docker.sh
4. run hello-world
$ sudo docker run hello-world