Nagios was originally designed to run under Linux, but also runs well on other Unix variants. It is free software, licensed under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.
There are many ways to install nagios in ubuntu or debian, it can be from source or fom repositories. For the new LinuxMint based debian, nagios3 is available in the repository, this mean that you can install it from the Synatic package manager or via command line:
sudo apt-get install nagios3
- Now you are ready to use Nagios, open your browser and type :