Docker X11 Ubuntu 20.04

Dockerfile

FROM ubuntu:20.04
RUN apt-get update && apt-get install -y x11-apps
ARG user=julian
ARG home=/home/$user
RUN groupadd -g 1000 $user
RUN useradd -d $home -s /bin/bash -m $user -u 1000 -g 1000 \
        && echo $user:ubuntu | chpasswd \
        && adduser $user sudo
WORKDIR $home
USER $user
ENV HOME $home
COPY entrypoint.sh .
ENTRYPOINT ["./entrypoint.sh"] 

entrypoint.sh

#!/bin/bash
echo "DISPLAY=$DISPLAY"
xclock  # x11 example application
echo "Done."
exec bash

instructions.txt

Instructions
============

- Adapt user in Dockerfile to match yours
- build and run

  chmod +x entrypoint.sh
  docker build -t x11 .
  docker run -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=$DISPLAY -h $HOSTNAME -v $HOME/.Xauthority:/home/$USER/.Xauthority x11