SHELL

Error starting userland proxy: listen tcp4 0.0.0.0:8080: bind: address already in use

sudo lsof -i -P -n | grep <port number>  # List who's using the port

Then run
sudo service <running service name> stop

Error starting userland proxy: listen tcp4 0.0.0.0:80: bind: address already in use.

sudo apt-get install docker-ce=5:20.10.17~3-0~ubuntu-focal docker-ce-cli=5:20.10.17~3-0~ubuntu-focal containerd.io docker-compose-plugin