Comment 2 for bug 1807047

why this?
  ubuntu-18.10-server-amd64.iso
It isn't listed on
http://releases.ubuntu.com/cosmic/
I did find it on:
http://cdimage.ubuntu.com/releases/18.10/release/

717M does fit so good.

What for?
hd-media installer needs it
https://launchpad.net/iso-scan
"""
debian-installer component to scan hard drives for an installer ISO image.
This is used in installer builds for removable USB drives.
"""

higher level goal: hd-media/boot.img is an fs I can mount, cp a replacement boot loader syslinux.cfg file, done.
.iso is a read only fs, so not as easy to replace the file.