The flag "on" image features the pirate flag, which was identified by our Sociology professors as a possible trauma trigger. I imagine that it was intended to be playful, but it's not necessary and us…
Attempting to pull a public docker image from docker.io returns a 404 page:
```sh
/usr/bin/python .../external/puller/file/puller.par --directory .../external/ubuntu_16_04/image --name docker.io/u…