In this tutorial, we will show how to install Collabtive 3.1 on Ubuntu 16.04. Collabtive is an open source web-based project management software written in PHP, that let you keep track of your projects. The main features of Collabtive are: task lists, milestones, time tracking, messaging / instant messaging, file management, role-based user permissions, reporting, exporting, calendaring and multilingual interface. This tutorial was tested and written for Ubuntu 16.04, but it should work on any Linux distribution. The entire process of installing Collabtive 3.1 on Ubuntu 16.04, should not take more than 10 minutes.