Addressing Ubuntu running out of space in root

cleanup_ubuntu_root_space.sh

#
# Copied from https://forums.linuxmint.com/viewtopic.php?t=338648

sudo apt autoclean
sudo apt autoremove --purge
sudo find /tmp -type f -delete
dpkg -l | grep '^rc' | awk '{print $2}' | sudo xargs dpkg --purge
rm -v -f ~/.cache/thumbnails/*/*.png ~/.thumbnails/*/*.png
# This next command failed for me
# sudo journalctl --vacuum-time=1s
sudo journalctl --rotate
sudo journalctl --vacuum-time=1s
# Restart system

# I later ran this after restart and whooops! 
# Found that docker was the source of maybe all my problems
sudo du -hs   /var/lib/* |sort -h

# I had some old docker containers that I no longer needed. Pruning was not working because they were running
# I did not need any docker containers running so I could stop and delete indiscriminately
docker kill $(docker ps -q) # kills all running containers
docker rm $(docker ps -a -q) # Deletes all stopped containers
docker rmi $(docker images -q) # Delete all images