Howtoforge published a tutorial about installing Invoice Ninja on Ubuntu 20.04.
How to Install Invoice Ninja on Ubuntu 20.04
Invoice Ninja is a free and open-source online invoicing app for freelancers & businesses that helps you to accept payments, track expenses, create proposals, and time-tasks. It is a self-hosted invoice application very similar to commercial invoice applications such as Freshbooks. It allows you to create your own custom invoice and send it online within a second.
