Wordpress on Ubuntu is not working

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http://askubuntu.com – I've been trying to get Wordpress to work on my Ubuntu 10.04 LTS system and nothing seems to work. I did everything as i should (according to http://codex.wordpress.org/Installing_WordPress) but I still can't access the Wordpress Setup Configuration page. At first I was getting the '404 Page not found' error but now when I enter it just says that the webpage is not available. With 'localhost/wordpress' i got the same result. How do I fix this? I've been at it for like 3-days! HELP PLEASE! (HowTos)