anchor.diff:                           jupyter-rsession-proxy==1.0b6 \
                            jupyterhub==1.0.0 \
                            jupyterlab==0.35.6 \
  -                         notebook==5.7.8
  +                         notebook==5.7.8 \
  +                         nbpdfexport==0.1
  +
  +# Ship headless chrome in the image
  +RUN pyppeteer-install
   
   # Install IRKernel
   RUN R --quiet -e "install.packages('IRkernel')" && \
  
positive.code: ENV HOME /home/${NB_USER}
  WORKDIR ${HOME}
  
  # Setup a LaTeX that notebook can use
  # texlive-local seems to be installed by rocker, and isn't enough
  RUN apt-get update && \
      apt-get purge --yes texlive-local && \
      apt-get install --yes texlive-xetex texlive-fonts-recommended texlive-generic-recommended && \
      apt-get clean && \
      rm -rf /var/lib/apt/lists/*
  
  
  RUN apt-get update && \
      apt-get install --yes \
  
negative.code: 
  USER ${NB_USER}
  
  
  RUN python3 -m venv ${VENV_DIR}
  
  