In order to install Ubercart we first need a running installation of Drupal. While a lot of work has been done to make Drupal easy to install, it still can be intimidating for many people. This section assumes that readers of this page have no, or little, knowledge in PHP, Apache (or any web server administration), and MySQL (or any database server administration), but are ready, willing, and able to learn (those daunted by this page might find the UberInstaller or using the ubercart package more to their liking). We will go through, in detail, each step to install Drupal on your website. If you already have a Drupal installation ready to go, you should move to the installing ubercart section.

Requirements
Drupal has a few system requirements that it needs to run. Depending on who does your web hosting for you, you'll need to find out whether they support these requirements. To put it briefly, the recommended requirements are Apache/PHP 5/MySQL 4.1 or 5.0. If you know your web host has these requirements skip to the installation section. 

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Courtesy : http://www.ubercart.org