Comment 4 for bug 267239

I know the update will try to go TO the newest if there is an internet connection, e.g. Gutsy to 8.04.1 even if the update CD is 8.04 which might be what you are thinking of.

But what if the upgrade is for a system that is NOT normally connected to the internet? That would be one reason to use a CD. Another would be a mass upgrade. If you have a bunch of systems at 8.04 Hardy, it would make things troublesome to have to update to 8.04.2 (or whatever) first through some means BEFORE the Ibex dist-upgrade would work.

I haven't tried the daily build CD/DVDs to see if they work to update packages upon insertion (though I usually turn autoplay stuff off)

One thing to do is to leave the package files uncompressed but support reading them compressed in Ibex going forward (or compress them in the very tight image-versions that couldn't fit otherwise, leaving them uncompressed in the rest, e.g. the live has them compressed, the alternate has them uncompressed, the DVDs all have them uncompressed).

I think jumping versions is already not supported (e.g. Gutsy directly to Intrepid), so that wouldn't be a problem. But if you ever come up with an updated Hardy master, it should include the fix for compressed package files on the CD.