You try to start the Docker service (e.g., with sudo systemctl start docker). You get this error: "Failed to start docker.service. Unit docker.socket is masked"
What should you do?
Possible solution #1
sudo systemctl unmask docker.socket sudo systemctl unmask docker.service
This solution was adapted from this blog.
Possible solution #2
Uninstall Docker. Install Docker via the docker-ce repo. If you install a different version of Docker, you may be able to get around this error.