On Tue, Mar 03, 2026 at 01:13:39PM +0100, Stevan Tiefert wrote:
> Am 03.03.2026 um 12:18 schrieb Antony Stone:
> > ...
> >
> Hello Antony,
>
> output as follows:
>
> /dev/sr0: BLOCK_SIZE="2048" UUID="2025-12-25-18-19-01-00" LABEL="DEVUAN610"
> TYPE="iso9660" PTUUID="33cf3ee5" PPTYPE="dos"

Hmm that looks like it *should* be recognised by the boot preamble.

Clearly the boot loading does start the preamble kernel and uses the
preamble initrd. (That's how you get the error messages)

One option might be to copy the ISO onto some other drive in the
system, so that the media mounting would find and use that. Possibly
you could boot from that other drive, or you could boot the preamble
this way that works, and then let it find the other installer media
for the second stage.

Another option is the use the "emergency modes" of the preamble, and
help the kernel find the DVD media through some hands-on in the
"emergency shell". There are 2 variants on that; use TAB on the
initial boot splash and add "EMERG" or "emerg" to the boot command
line.

The uppercase mode is a very early busybox shell in the preamble, and
the lowercase mode is late in the preamble init. You'll need to have
your hacker pants on to use the emergency modes, because you'll need
to manually mount the media, manually unpack the installer initrd, and
manually exec-switch to it. Basically, you would peep at the preamble
/init script to figure out what needs to be done, though also deal
with finding and mount the media in a better way than that scripting.

Clearly, to present an additional/alternative media would be an easier
solution than exploring the emergency modes. But, in any case I would
suggest that you DVD creation is fine.

hth Ralph.