You want Ubuntu Server Edition:
http://www.ubuntu.com/products/WhatI.../serveredition
Which comprises the Linux part and should give you the option to install Apache, MySQL, and PHP (thus completing the LAMP) setup when you run the installer.
Webmin is available here:
http://www.webmin.com/
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Useful looking guide for installation/setup (for an older version, but should provide good info):
http://www.howtoforge.com/lamp_installation_ubuntu6.06
This is a good guide as well:
http://www.ubuntugeek.com/ubuntu-710...ver-setup.html