When you first install Docker in Ubuntu, you might get some permission error messages. To fix that, I use the commands below.
Error Message:
Got permission denied while trying to connect to the Docker daemon socket at ….
Initial Fix:
sudo groupadd docker
sudo gpasswd -a $USER docker
newgrp docker.docker folder permission warning fix
sudo chown "$USER":"$USER" /home/"$USER"/.docker -R
sudo chmod g+rwx "/home/$USER/.docker" -R