You have no web server installed.
You'd like to install a web server for your Laravel application to use.
Here are the instructions for Ubuntu 13.04.
laravel:~$ sudo apt-get install -y php5-fpm nginx laravel:~$ sudo service nginx start
Nginx is pronounced "engine-x".
Nginx is rapidly becoming the favorite web server for techies everywhere.
It's fast, easy to configure, and doesn't use as much memory as Apache.
See also Creating a Nginx VirtualHost