Yes, the ISOs have 3 boot equipments, to cater for booting from CD/DVD
or disk with legacy bios boot, and CD/DVD or disk with UEFI bios boot
(though I'm not sure UEFI bios has a CD/DVD boot option).

And, the messages you get come from the preamble, which means that the
kernel is loaded and started with the unpacked preamble. That boot
stage sets up device drivers for the drivers, and when things work, it
will mount the media so as to load and run the installer initrd.

The preamble system is already an initrd unpacking with a filesystem,
but (for technical reasons) restricted to fit (compressed) within a 32
MiB FAT filesystem. At a guess, the required module(s) for your DVD
device are included but the module loading scheme (which is a small
udev setup) fails to load them for some reason. You might be able to
figure that out and "resucue it" with the preamble shell.

You could also try a "live" installer, although itt will want to find
the media as well with a similar bootup procedure but its boot
equipment is slightly different.

Ralph.

On Wed, Mar 04, 2026 at 01:42:28PM +0100, Marko Randjelovic via Dng wrote:
> On 2026-03-03 12:13, Stevan Tiefert wrote:
> > Am 03.03.2026 um 12:18 schrieb Antony Stone:
> > > On Tuesday 03 March 2026 at 12:09:45, Stevan Tiefert wrote:
> > >
> > >> Am 02.03.2026 um 22:53 schrieb Ralph Ronnquist via Dng:
> > >>> On Mon, Mar 02, 2026 at 11:12:46AM 0000, Stevan Tiefert wrote:
> > >>>> Hello,
> > >>>>
> > >>>> If I download any of the 6.1.0 ISOs (doesn't matter if dvd,
> netinstall
> > >>>> or server) and burned on a DVD and try to install devuan I got on
> > >>>> machines with and without UEFI, errors like
> > >>>>
> > >>>> LABEL=DEVUAN610: Can't lookup blockdev
> > >>>> LABEL=Ventoy: Can't lookup blockdev
> > >>>> failed to mount the cdrom
> > >>>> Starting emergency shell
> > >>> When you write "burned on a DVD" I'm guessing you mean something else
> > >>> than simply copying the ISO onto the initial blocks of the DVD, and
> > >>> that that resulted in something else than a true copy of the ISO
> > >>> bytes.
> > >> Hello Ralph,
> > >>
> > >> I've done this on a commandline:
> > >>
> > >> cdrskin -v dev=/dev/sr0 devuan_excalibur_6.1.0_amd64_netinstall.iso
> > >>
> > >> Did I miss an option?
> > > I'm not familiar with cdrskin, but after you have done the above, what
> does
> > > "blkid /dev/sr0" tell you?
> > >
> > >
> > > Antony.
> > >
> > 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"
>
> Are you sure the iso images are made to be burned on a DVD, as netinstall
> and
> server can fit on a CD and desktop is too big for a DVD?

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