Unfortunately this isn't something we can provide. Your best fallback
may be something like BitTorrent.
As you may know, jigdo operates by assuming that many of the sequences
of bytes in the ISO image are identical to sequences of bytes in files
that can be downloaded from a local mirror. For the alternate and server
install CDs, this works excellently: they consist mainly of a large
number of .deb packages, and the ISO image format is such that you can
construct a template that just replaces each .deb with a placeholder.
However, the desktop CD consists mainly of a squashfs image. While the
contents of this image mostly originally came from those same .debs,
they have pretty much been scrambled by the process of unpacking into a
filesystem image, rearranging some bits and pieces, and then
recompressing the whole lot into a squashfs image. There are no byte
sequences here that can simply be provided by .deb packages from a local
mirror, and so the jigdo system is simply not smart enough to deal with
it. (Even if it were that smart, it would be very complex and probably
require a number of additional tools.) If you try to construct a jigdo
file from a desktop CD image, the result is a .template that's nearly as
big as the CD image was to start with; you just don't gain very much.
The DVD is an awkward case. Yes, you would gain something by using jigdo
for it, because a large part of it does consist of .deb files. However,
the DVD also contains a 1.6GB squashfs image, and so by the argument
above the .template would be at least 1.6GB. We are already somewhat
short of disk space on cdimage, and I don't think it's worth dedicating
an extra 1.6GB per DVD, especially since this is still a fairly
intimidating download proposition. So, I'm afraid we don't plan to
provide jigdo here either for the moment.
** Changed in: ubuntu
Sourcepackagename: net-retriever => None
Status: New => Won't Fix
--
download way for DVD & desktop
https://bugs.launchpad.net/bugs/245889
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