fix error on ubuntu command

unable to resolve host: $(hostname)

fix by:

echo $(hostname -I | cut -d\  -f1) $(hostname) | sudo tee -a /etc/hosts

docker error:

Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.26/images/json: dial unix /var/run/docker.sock: connect: permission denied

fix by:

sudo newgrp docker

sudo gpasswd -a boss docker

output: Adding user boss to group docker

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