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"Requested runtime not available for this stack" - Dokku

While using Dokku, I was getting the following error message: Requested runtime (python-2.7.8) is not available for this stack (cedar-14).

This was due to a connection error between my docker container and the internet. To determine this, I ran "docker images" and got the image id of "programium/buildstep", then got into a container with the following command: sudo docker run -t -i <your image id> /bin/bash

Once in the container, I ran:
curl -s

If that is unsuccessful, that should confirm it's a connection issue.

This was the solution to the problem: