Ryan Michal

Thanks. My app is working. I had to follow ROD's solution above plus install a newer version of yarn so that I could install webpacker.

sudo apt-get update
sudo apt-get install yarn
rails webpacker:install

You'll also want to add host/port/username/password to default in the database.yml before running rake

My 'rails new myapp...' was not generating the project I expected. For instance there was no config/database.yml This solution did the trick. Thanks.