You have to install LAMP before it will run. The easiest way to do this in Ubuntu is to run this command.
xxx@xxx-pc1: sudo tasksel
This will start tasksel which opens a dialog box and allows you to select and install several components, one of which is LAMP. Installing LAMP will give you Apache, PHP and MySQL all wrapped up and working together. It will also make an entry in /etc/init.d to start it all up for you automatically.
If Tasksel is not installed then install it like so:
xxx@xxx-pc1: sudo apt-get install tasksel
Once in tasksel just follow the inputs and provide some basic answers and you're off and running