Not so much an issue, more a scream of frustration into the abyss…
Followed the Quickstart "Getting started on your own machine using Docker" instructions.
All sorts of stuff happened, including lots of stuff in red, none of which made any sense to me.
The final line before it kicked me back to the command prompt was.
Removing intermediate container 56874fb120c2 The command '/bin/sh -c ${KERNEL_PYTHON_PREFIX}/bin/pip install --no-cache-dir -r "binder/requirements.txt"' returned a non-zero code: 1
No idea what that means. I never saw a URL to launch the docker. Guess I won't be using the docker for the book. Which is a shame as I have no idea about the Git instructions either...