Can debian-live-9.0.1-i386-lxde be made to install from USB?

[Erik Christiansen <dvalin@internode.on.net>]

After downloading
https://cdimage.debian.org/debian-cd/current-live/i386/iso-hybrid/debian-live-9.0.1-i386-lxde.iso
and putting it on a USB stick with unetbootin, the install spuriously
stops due to an obsessive excursion to mount a (non-existent) CDROM. The
link to the download page says: >> "Hybrid" ISO image files suitable for
writing to DVD-R(W) or CD-R(W) media, depending on size, and also USB
keys of the appropriate size. << So it does claim to work with USB.

How to keep the install process on the media it has used up to that
stage, and install as advertised?

An attempt to install ubuntu 16.04, using the same USB/unetbootin method
went fine for most of the install, but barfed when trying to write the
boot block. So it's not unetbootin which has an unhealthy CDROM obsession.

Any clues gratefully received.

Erik