"E: Unable to locate package python-pip", Python 3.6.10, pip 9.0.3

So I started the tutorial for Mythical Mysfits and when I try to implement the docker build: docker build . -t REPLACE_ME_AWS_ACCOUNT_ID.dkr.ecr.REPLACE_ME_REGION.amazonaws.com/mythicalmysfits/service:latest
(yes with my credentials and in the /app folder)
then I get the error message "E: Unable to locate package python-pip".
When I check for Python version its Python 3.6.10
and pip is pip 9.0.3.

All searches lead me to ubuntu installs, what am I supposed to do?