Keep getting Could not read CA certificate when trying to start docker

Question

I am attempting to migrate from boot2docker to docker-machine.

I followed the directions here to install docker but I keep getting the following message:

Answer 1

My solution in macOS to clean the reference to the missing certs, that were not in ~/.bash_profile or ~/.bashrc was:

unset ${!DOCKER*}

Source: https://forums.docker.com/t/initial-install-of-docker-for-mac-could-not-read-ca-certificate/9170/7