1. Create a preseed.txt file and load it on an accessible web server
2. Boot the machine to be installed to the install menu using the LiveCD
3. Highlight “Install” on the menu
4. Press Tab key to append kernel boot parameters
5. Add the following to the boot line: 

auto=true url=http://ip.address/preseed.txt

(Replace ip.address with your servers IP address or hostname)

Press Enter to begin the automated installation.

*Note: the automated installation will format the destination without warning if partition details are defined in the preseed file, so take caution when using preseeded installations.