I am trying to do some basic Python Selenium tests in AWS. My idea was to have CodeBuild run them and then deploy...pretty basic, right?

However, I was having a lot of trouble with xvfb using an AWS provided image such as aws/codebuild/python:2.7.12

So I decided to use a docker image that the nice people at Selenium made: https://github.com/SeleniumHQ/docker-selenium/tree/master/StandaloneFirefox

I ran into the issue in the title and I am fairly certain it is not because of too little RAM (I tried 3GB and 7GB).

I have also tried extending the Selenium docker file to ensure glibc is install:

FROM selenium/standalone-firefox:latest

RUN sudo apt-get -y update && sudo apt-get install -y build-essential

Any ideas where the problem is?