Public bug reported:

Following a discussion with cjwatson on #ubuntu-installer :

The installation guide at 
https://help.ubuntu.com/8.04/installation-guide/i386/preseed-contents.html
mentions:
""""
Of course, preseeding the network configuration won't work if you're loading 
your preconfiguration file from the network. But it's great when you're booting 
from CD or USB stick. If you are loading preconfiguration files from the 
network, you can pass network config parameters by using kernel boot 
parameters. 
"""

Based on this I would assume that when creating a custom installer based
on the mini.iso netinst image, because one "boots from the CD", network
config parameters can be put in the preseed file. However, as cjwatson
explained,  the mini.iso reads the CD _after_ configuring the network
and thus network config options have to be given as kernel boot
parameters.

I suggest rewording the above paragraph to:
"""
Of course, preseeding the network configuration won't work if you're loading 
your preconfiguration file from the network. But it's great when you're 
installing from CD or USB stick. If you are loading preconfiguration files from 
the network or booting from a "netinst" CD image, you have to pass network 
config parameters by using kernel boot parameters.  (When using the "netinst" 
image, although the kernel boots from the CD, the preseed file is only read 
after configuring the network; even the CD drivers are loaded from the network.)
"""

(note: I am not sure "netinst" is the right word here, I think other
parts of the ubuntu homepage, for example where one can download the cd
images, use a different terminology)

Also, what kernel parameters to use should be documented. Is it simple that any 
"d-i netcfg/foo type bar"
can be put on the kernel parameters as
"netcfg/foo=bar"?

** Affects: installation-guide (Ubuntu)
     Importance: Undecided
         Status: New

-- 
description of presseding netcfg settings and when to use preseed file and when 
to use kernel command line settings not clear enough
https://bugs.launchpad.net/bugs/262330
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