This script is based on Chapter 1 of Odoo 12 Development Cookbook Third Edition
wget https://raw.githubusercontent.com/alanhou/odoo12-cookbook/master/Chapter01/odoo-install.sh
sudo chmod +x odoo-install.sh
sudo ./odoo-install.sh
ps -ef | grep odoo | awk '{ print $2}' | xargs kill -9
~/odoo-12.0/bin/python3 ~/odoo-dev/odoo/odoo-bin -d odoo-test