anchor.diff:      && ~/.conda2/bin/conda update --all \
       && ~/.conda2/bin/conda clean -tipsy \
       && chmod +X /dockerstartup/*.sh && chmod 755 /dockerstartup/*.sh \
  -    && /dockerstartup/generate_container_user.sh \
  -    && chmod 755 $HOME/.vnc/xstartup && chown dugong:dugong $HOME/.vnc/xstartup \
       && chmod +x /usr/local/bin/start.sh \
       && chmod +x /usr/local/bin/start-notebook.sh \
       && chmod +x /usr/local/bin/start-singleuser.sh \
  -    && mkdir -p /headless/.cache/sessions/ && echo "" > /headless/.cache/sessions/xfce4-session-DugongGUI:1 \
  +    && /dockerstartup/generate_container_user.sh \
  +    && chmod 755 $HOME/.vnc/xstartup && chown dugong:dugong $HOME/.vnc/xstartup \
       && /bin/bash /headless/install/set_user_permission.sh /dockerstartup /headless
  -    
  +
   USER dugong
   
   RUN ~/.conda2/bin/conda update --all \
       && ~/.conda2/bin/conda install spyder anaconda-navigator jupyter \
       && ~/.conda2/bin/conda clean -tipsy
  -    
  +
   USER root
   
   ############### http://bugs.python.org/issue19846
  
positive.code: ENV NB_USER dugong
  ENV NB_UID 1000
  
  ADD .config/GUI/xfce/ $HOME/
  ADD .config/scripts $STARTUPDIR
  ADD .config/scripts/.bashrc $HOME/.bashrc
  ADD .config/install/ $INST_SCRIPTS/
  
negative.code:     && wget -qO- https://github.com/kanaka/websockify/archive/v0.8.0.tar.gz | tar xz --strip 1 -C $NO_VNC_HOME/utils/websockify \
      && chmod +x -v $NO_VNC_HOME/utils/*.sh && ln -s $NO_VNC_HOME/vnc_auto.html $NO_VNC_HOME/index.html \
      && apt-get -f install && rm megasync-xUbuntu_16.04_amd64.deb megacmd-xUbuntu_16.04_amd64.deb \
      && apt-get update && apt-get install -y --allow-unauthenticated icewm xterm xfonts-base xauth xinit icewm-themes \
      && apt-get autoremove -y && apt-get clean -y \
      && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
      && locale-gen en_US.UTF-8 \
      && git clone https://github.com/Linuxbrew/linuxbrew.git ~/.linuxbrew \
  