Yep, when installing Ubuntu Server, you will auto have Apache, MySQL, and PHP, and if you like, download and install phpMyAdmin and you're on the way; also, as smccarthy945 already posted, it's very easy to get your sites up w/ LAMP ;-)
Have fun,
FREE One A DayFREE PhotoFREE GamesFREE WebsitesFREE Portable GPSFREE WAMP Guides