title: The command '/bin/sh -c apt-get update' returned a non-zero code: 100 in docker file
body: <p>My DockerFile as follows:</p>
  
  <pre><code>FROM python:3.6
  RUN wget -qO - https://www.mongodb.org/static/pgp/server-4.2.asc | apt-key add -
  RUN echo "deb [ arch=amd64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.2 multiverse" | tee /etc/apt/sources.list.d/mongodb-org-4.2.list
  RUN apt-get update
  RUN apt-get install -y mongodb-org
  ADD . /app
  WORKDIR /app
  RUN pip install -r requirements.txt
  RUN mongod --fork --config /etc/mongod.conf
  EXPOSE 9000
  </code></pre>
  
  <p>At <code>apt-get update</code> getting an error :</p>
  
  <pre><code>Reading package lists...
  E: Failed to fetch http://cdn-fastly.deb.debian.org/debian/dists/buster/main/binary-amd64/by-hash/SHA256/6233101b7f58c6cf71fe1cd46b962cf358fc5626ed8cb94201f5e0e939e91d73  Connection failed [IP: 151.101.36.204 80]
  E: Some index files failed to download. They have been ignored, or old ones used instead.
  The command '/bin/sh -c apt-get update' returned a non-zero code: 100
  </code></pre>
  
  <p>Thanks In Advance</p>