Odoo formerly known as OpenERP is an open-source and all-in-one self-hosted CRM application. It is designed for businesses and individuals who want to manage their customers, invoices, orders, products, inventories, sales, projects and more. It is written in the Python programming language and used by thousands of businesses worldwide to manage their CRM and ERP processes. It also provides human resources and accounting add-ons to manage the business employees and finances. Learn how to speed up Odoo.

This an easy way to install Odoo 16 Community on Ubuntu 20.04

wget -O - https://nightly.odoo.com/odoo.key | sudo gpg --dearmor -o /usr/share/keyrings/odoo-archive-keyring.gpg

echo 'deb [signed-by=/usr/share/keyrings/odoo-archive-keyring.gpg] https://nightly.odoo.com/16.0/nightly/deb/ ./' | sudo tee /etc/apt/sources.list.d/odoo.list

sudo apt-get update && sudo apt-get install odoo

Now you can set your database and using Odoo at
http://IP or localhost:8069