Re: black screen on installer grub menu

[Will Senn <will.senn@gmail.com>]

Hi Thomas,

Good catch!

OMG. I spent all that time tracking this down, figuring out a fix and 
then while I'm tweaking files, rebuilding the iso, etc. I accidentally 
do in my iso and have to grab latest off the mirror. When I do, it's 
13.1, but I don't notice, and I go along merrily applying my fix to the 
iso. As it turns out, I "fix" the already fixed iso. Apparently, the 
developers did address it!

Thanks,

Will

On 9/7/25 7:26 AM, Thomas Schmitt wrote:
> Hi,
>
> while digging further in direction of Debian installation ISOs i came
> to these lines in
>    /boot/grub/grub.cfg
> of  debian-13.1.0-amd64-netinst.iso :
>
>    # Added as a workaround for #1110759
>    echo "Loading bootloader..."
>    terminal_output gfxterm
>
> This is another bug number but also the hope that the problem is dealt
> with at least in debian-cd.
>
>
> Now i wonder why your debian-13.1.0-amd64-DVD-1.iso needed an extra
>    echo ""
> in its /boot/grub/grub.cfg .
>
> Do you see the comment line and the echo line in the grub.cfg of the
> ISO image which you used ?
> Do you know the SHA256SUM of the original ISO after download but before
> packing it up again ?
>
>
> Why i riddle:
>
> Downloading
>    https://cdimage.debian.org/debian-cd/13.1.0/amd64/iso-dvd/debian-13.1.0-amd64-DVD-1.iso
> yields an ISO with SHA256 matching the SHA256SUMS file:
>    fd941eefaff97349e81f82090c0b32eef7b96518e1361666052e11f39b02711d
>
> I see in the ISO 9660 filesystem in file  /boot/grub/grub.cfg
> at line 16 ff. the same workaround comment and echo command as in the
> netinst ISO.
> The next line is the only one with command "terminal_output" in the
> grub.cfg file. It does not look as if other GRUB files would be
> interpreted in the lines before.
>
> The grub.cfg file in the EFI partition
>    /efi/debian/grub.cfg
> sources
>    /boot/grub/x86_64-efi/grub.cfg
> in the ISO 9660 filesystem which sources
>    /boot/grub/grub.cfg
> in the ISO 9660 filesystem.
> So no "terminal_output gfxterm" to see before the workaround lines.
>
> If an additional
>    echo ""
> is indeed needed, then this should be reported to
>    1110759@bugs.debian.org
>
>
> Have a nice day :)
>
> Thomas