Digging through the Ubuntu help docs, specifically InstallationLocalNet, today was rather frustrating. There was not one specific (modern) way given, in said documentation: they illustrated using BOOTP?!?! That said, time to make this work using (i)PXE.
The ubuntu alternate install discs do not have the casper live system which allows for the disc files to be pulled over NFS or CIFS (Samba). Although, with the existing preseed framework (extended from Ubuntu's parent, Debian), one can pull from a local network package repository (the expanded disc image files).
I use iPXE for various reasons, instead of the generic PXE setup involving TFTP and a complicit DHCP server, which is able to use HTTP and DHCP itself without the niceties of a LAN where you have access to the DHCP boot options.
kernel ubuntustudio-11.04-alternate-i386/install/netboot/ubuntu-installer/i386/linux initrd ubuntustudio-11.04-alternate-i386/install/netboot/ubuntu-installer/i386/initrd.gz imgargs linux append auto url=http://<?php echo $server_ip; ?>/tftp/boot/preseed_ubuntustudio.cfg language=en country=US console-keymaps-at/keymap=us keyboard-configuration/xkb-keymap=us keyboard-configuration/layoutcode=us console-setup/ask_detect=false --
#Debian 6 options d-i debian-installer/locale string en_US d-i console-keymaps-at/keymap select us d-i keyboard-configuration/xkb-keymap select us d-i netcfg/choose_interface select auto #Ubuntu Natty specific options # ubuntustudio.seed linked from ubuntustudio-11.04-alternate-i386/preseed/ubuntustudio.seed d-i preseed/include string ubuntustudio.seed # Installation source d-i mirror/country string manual # hostname This is whatever HTTP server you have set up. d-i mirror/http/hostname string bigboy # This is the /ubuntu directory from the install CD copied (or linked) under the webroot of your HTTP server. Must be "/ubuntu" otherwise this will not work. d-i mirror/http/directory string /ubuntu # Name your ubuntu version here d-i mirror/suite string natty # no proxy d-i mirror/http/proxy string
I am able to use the above after extracting the contents of the ubuntustudio iso to a location (the ubuntustudio-11.04-alternate-i386 directory) on my fileserver accessible from my HTTP server. Now I am able to do an entirely network based boot from the contents of the ubuntu alternate disc.