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How to install OTRS (OpenSource Trouble Ticket System) on Ubuntu 16.04

In this tutorial, I will show you how to install and configure OTRS on Ubuntu 16.04. I will use PostgreSQL as the database for OTRS, and Apache web server as the web server. OTRS or Open-source Ticket Request System is an open source ticketing software used for Customer Service, Help Desk, and IT Service Management.