While setting up docker on Ubuntu 20.04 you might run into below issue permission denied error is shown while trying to execute any docker command.
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/json": dial unix /var/run/docker.sock: connect: permission denied
To fix the issue in execute below two commands and docker in your Ubuntu 20.04 machine will run just fine.
sudo chmod 666 /var/run/docker.sock
sudo setfacl --modify user::rw /var/run/docker.sock