It's quite easy actually, once you know where to look.
Just browse to http://archive.ubuntu.com/ubuntu/dists/
[version]/main/installer-
[arch]/current/images/netboot/ubuntu-installer/
[arch]/ - eg
http://archive.ubuntu.com/ubuntu/dists/intrepid/main/installer-i386/current/images/netboot/ubuntu-installer/i386/.
The two files "linux" and "initrd.gz" can be used with pxegrub to boot a PC with a fully-working Ubuntu-installer (text-mode). See
my other posts about my diskless / network boot setup for details on how I configured the network booting part, based on dhcp, tftp and pxegrub.
Alternatively, if you have a CF card USB stick etc. with a working GRUB install, you can just copy the two files over there.
What I still haven't found is how to do an Ubuntu NFS install directly. For now I'm stuck with
my diskless Ubuntu install procedure where I first do a hard disk install and then make it diskless.
Credits: the whole thing was inspired by
this article.
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