I'd certainly "argue" :-) / advocate, that the .jigdo files and
archive(s)/repository(/ies) of Ubuntu ought be such that
jigdo-lite(1) (and/or other Jigdo clients) can successfully create the
relevant target .iso files.  Even though there may have been
updates (patches / security fixes) since ubuntu-16.04.3-server-amd64.iso,
ubuntu-16.04.3-server-amd64.iso is still (at least as I'm writing this)
the most current ISO for that flavor/variant (Ubuntu-Server LTS amd64),
and ought not only be downloadable (as it is), but ought be able to
reassemble it via Jigdo (saving both clients, networks, and servers,
much bandwidth and time compared to entirely downloading the full
ISO file, which is in substantial part redundant with the earlier
ubuntu-16.04-server-amd64.iso file).
E.g. after otherwise managing to assemble/download, and then "seed" it
to BitTorrent - still quite popular (folks have already downloaded a
fair chunk of it from me in relatively little time) - so there's
certainly no lack of interest in obtaining the iso ... that's also
typically what folks would boot from if that's what they want to
install.
 ------------------------------------------------------------------------------
| Filename                                          Size   Download     Upload |
...
| ubuntu-16.04.3-server-amd64.iso               825.0  M   0    B/s   0    B/s |
| ^---  download succeeded!                                0.0  M   234.8  M   |
...
 ------------------------------------------------------------------------------

As noted much earlier on:
https://lists.ubuntu.com/archives/ubuntu-us-ca/2014-December/002551.html
Ubuntu may still have the individual files downloadable elsewhere,
... that's a start ... but things need to properly line up between
what's in the .jigdo files, and where and how things are downloaded.

E.g. with Debian :-) one can still use jigdo to assemble iso images
back to or nearly to 3.0_r0 (Woody), which was released 2002-07-19,
by using the relevant .jigdo file(s) from:
http://cdimage.debian.org/mirror/cdimage/archive/

Ubuntu ought maintain its archives and .jigdo files so the .iso files
can be assembled with Jigdo clients (e.g. jigdo-lite).  Failure to do so
just causes lots of repeat problems for various folks, and much losses
in efficiency (of downloads, bandwidth, people's time, etc.).  This
really needs to be fixed systemicly and in the process/procedures, so
they're properly maintained and validated.  Shouldn't keep having this
problem over and over and over again.

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https://bugs.launchpad.net/bugs/1731762

Title:
  jigdo: files missing on archive http://archive.ubuntu.com/ubuntu/ -
  cannot assemble, e.g. ubuntu-16.04.3-server-amd64.iso

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