You said
> "I think you are looking for providing a preseed file,
hence my advice
https://www.google.nl/search?q=virtualbox+host+http+server+for+guests";

1. You're correct in that I'm looking to provide preseed file. But
host-side HTTP server won't work for my needs, unless VirtualBox has
it integrated. My technology is aimed at people, who require *zero*
configuration, and should work across all hosts. Like click, click,
click...
Basically I need very minimal (and portable) host-side logic (and move
as much complexity into the guest as possible).

You said:
"Do an "attended install". Verify that reading from floppy is possible.
That is important. It proofs that the Virtualbox host provides
a "floppy disk controller" and that the Vbox guest has a kernel kernel
for the f.d.c.  Also it shows there is /dev/fd0 (IIRC)"

2. Well... you'r right ! /dev/fd0 is the problem !
Yes, I ensured, that VM has floppy controller configured, plus
floppy.img inserted.

Debian 8 (mini-)kernel (inside amd64-DVD) does NOT see /dev/fd0 !
(part of debian-installer); This works just fine with Debian 6 and 7 !
Post-install Debian 8 kernel _does_ see /dev/fd0, can loop-mount and
can read files from it. (after installing from Debian 8 amd64-DVD), so
no problem here.

The natural question: Are those kernels different ? (I always assumed
it is the *same* kernel)
It seems the mini-kernel does not provide me with "/proc/config.gz",
so I have no clue what's included and what's excluded.
How can I check ?

Thanks for finding the problem !

-Alexey


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