Install Odoo 9 on Ubuntu 14.04

In this tutorial, we will show you how to install Odoo 9 on an Ubuntu 14.04 VPS.
Odoo is a suite of business applications written in Python. In the new version of Odoo there are major changes in accounting section. Also Fabien Pinckaers and Odoo Twitter feed listed some new features like accounting module rewrite, voice over IP module, an improved forum with social network integration, a much better mass mailing app, etc.