We were having a problem with a redirection issue in one of our projects. We had a page that had the url(i.e. path alias in Drupal) as /index. Whenever that page was called, Apache would append to it .php extension and the request gets routed to index.php which is NOT the desired effect.

This was due to the option "MultiViews" being enabled on our new Debian installation. For more info, read this.

I added this line to our .htaccess.Read more

This article applies to Ubuntu with Apache 2, MySQL 5 and PHP 5 installed from the package manager.

When you start using Drupal on Ubuntu, one of the first things to do is to enable clean urls. That page will first ask you to run the clean URL test, which will show you if the underlying Apache infrastructure is ready for this or not. It it's ready, clicking the test link should bring you back to the same page, but with the radiobuttons enabled. Otherwise, you will get a "page not found" error.Read more