Docker Ubuntu instance not connecting to the network

I am running Docker 1.12.1 on macOS Sierra 10.12.1. I have downloaded an Ubuntu 16.04 image which I intend to configure to use as the basis for my Webpack building on Bitbucket Pipelines. I received a very frosty response on StackOverflow so I’m posting here.

There are a handful of questions on StackOverflow pertaining to this issue. I have followed them all, but yielding only meagre results.

It appears that my Ubuntu instance is not connected to the network. I know enough about networking to diagnose this problem, but not enough to investigate or fix. Can anyone help?

Solved! Used an older version of Ubuntu.