Debian's debian-installer documentation says:
(http://d-i.alioth.debian.org/manual/en.i386/ch04s07.html#automatic-install)
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Alternatively, one way to get a complete file listing all the values that can be
preseeded is to do a manual install, and then use debconf-get-selections, from
the debconf-utils package, to dump both the debconf database and the cdebconf
database in /var/log/debian-installer/cdebconf to a single file:
$ debconf-get-selections --installer > file
$ debconf-get-selections >> file
However, a file generated in this manner will have some items that should not
be preseeded, and the file in Section C.1[1], “Preconfiguration File Example” is
a better starting place for most users.
[1] http://d-i.alioth.debian.org/manual/en.i386/apcs01.html
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I tried the method above, but the installer still had trouble completing without
prompting me for debconf questions despite the fact that they were already
answered by the preseed file. (I tried a variety of preseed files) It'd be great
if Ubuntu could provide a starter preseed file which includes, for example,
entries for specifying the country-code based Ubuntu mirror. I've been able to
seed the installation such that when the installer prompts me for a mirror, only
us.archive.ubuntu.com appears in the list, but I have not been able to get the
installer to not ask me.
I did find
ftp://ftp.belnet.be/packages/ubuntu/ubuntu/dists/breezy/main/daily-installer-i386/20050317ubuntu5.0.20050615/doc/manual/example-preseed.txt
but this seems to be a copy of the Debian example as it preseeds exim. (though
"Ubuntu" does appear in here which is probably a mass s/Debian/Ubuntu/g thing.)
http://
It may be out of date, though, and I'm not sure that the country-code mirror
thing is actually preseedable yet. Current preseed/debconf (possibly post-Hoary)
allow you to tweak the seen flag separately.