anchor.diff:  
   # Docker image used for running tests the under all the supported Python
   # versions
  -FROM ubuntu:18.04
  +FROM ubuntu:20.04
   
   RUN set -e && \
       apt-get update && \
  
positive.code:       libssl-dev
  
  # Workaround for zipp import error issue - https://github.com/pypa/virtualenv/issues/1630
  RUN python3 -m pip install --upgrade pip
  
  RUN set -e && \
      python3 -m pip install --no-cache-dir "tox==3.20.1"
  
  COPY . /libcloud
  
  WORKDIR /libcloud
  
  CMD ["tox", "-e", "lint,py3.5,py3.6,py3.7,py3.8,pypypy3"]
  
negative.code:     add-apt-repository ppa:pypy/ppa && \
      apt-get update && \
      apt-get -y install \
        python3.6 \
        python3.7 \
        python3.8 \
        python3.9 \
        python3.10 \
        python-dev \
        python3.6-dev \
        python3.7-dev \
        python3.8-dev \
        python3.9-dev \
        python3.10-dev \
        python3.7-distutils \
        python3.8-distutils \
        pypy3 \
        pypy3-dev \
        python3-pip \
  