...
sudo ./other/install_debian_ubuntu.sh
Post Install
The script should complete and you should be able to open a browser and go to to http://SERVERNAME/index.php and and be presented with a logon screen. Change the Admin user password by going to Admin -> List Users -> Edit User. Enable Enable some Reports by going to Admin -> Reports -> Activate Report. Enable some Groups by going to Admin -> Groups -> Activate Group.
Notes
If you wish to change the MySQL user and password, the application config file is at /usr/local/open-audit/code_igniter/application/config/database.php
You can tune php.ini to your liking. You may not wish to show errors, but they are useful for debugging and bug reporting.