boot disks

[Robert Hemus]

Folks, I apologize for asking this elementary question knowing I could
find the answer with a little research, but I'm in a bind for time.  It
is beginnining to snow up high (5000'), and I have to finish pushing 2
chunks of half-inch hardline co-ax down a 4' conduit 600+ feet and
another day to finish the job, ends,hook-ups, etc.  Soooo, How do I make
a boot disk for an Ubuntu partition from the install disk?  My grub is
on that partition and I get the no disk to boot from or something
similar when I boot up.  I do have a boot disk for this LN 2.8.1.
Thanks very much.
Bob