sudo apt-get install docker.io

docker build -t viber_root:0.1 .

xhost +
sudo docker run --name viber -it -e DISPLAY=unix$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix -v /dev/snd:/dev/snd --privileged -t viber_root:0.1

docker run --name viber -d viber_root:0.1 

docker rmi viber_root:0.1 -f

or create forever
sudo docker create \
        -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=unix$DISPLAY -v /dev/snd:/dev/snd  \
        -v ~/.ViberPC:/home/gui/.ViberPC  \
        --privileged --name viber  -t viber_root:0.1
sudo docker start viber

https://github.com/ezbik/docker/tree/master/viber

touch: cannot touch '/home/gui/.config/mimeapps.list': No such file or directory
/usr/bin/xdg-mime: 844: /usr/bin/xdg-mime: cannot create /home/gui/.config/mimeapps.list.new: Directory nonexistent

No browser installed, so viber cannot open a new browser window (intentional)

https://askubuntu.com/questions/22031/what-are-my-audio-devices
aplay -l

https://www.digitalocean.com/community/tutorials/how-to-remove-docker-images-containers-and-volumes
https://stackoverflow.com/questions/18497688/run-a-docker-image-as-a-container
https://linuxize.com/post/how-to-remove-docker-images-containers-volumes-and-networks/
https://www.tutorialspoint.com/docker/building_docker_files.htm
https://docker-curriculum.com/
https://www.howtoforge.com/tutorial/how-to-create-docker-images-with-dockerfile/