Redmine is a flexible, open-source project management web application based on the Ruby on Rails framework. Some prominent features of Redmine are: * Multiple projects support, including sub-projects. * Multiple databases support. * Flexible role-based access control. * Multiple languages support. * Issue tracking systems. * Time tracking to check activity duration on projects. * Gantt chart and calendar to check project timelines. This article describes how to install Redmine on Ubuntu 20.04 se......