anchor.diff:    adduser core plugdev && \
     mkdir -p /home/core/ && \
     chown core:core /home/core && \
  +  passwd -d core && \
     echo "core    ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
   
   RUN systemctl set-default graphical.target && \
  
positive.code: RUN \
    adduser core \
    --no-create-home \
    --gecos "Core" \
    --shell /bin/bash \
    --disabled-password && \
    adduser core audio && \
  
negative.code: FROM ubuntu:focal as stage1
  
  # setup environment
  ENV LANG=C.UTF-8 \
      LC_ALL=en_US.UTF-8 \
      container=docker
  
  # Core packages, including ubuntu-desktop-minimal.
  RUN export DEBIAN_FRONTEND=noninteractive; \
  