You are right. It works without using the APPEND option,like this : (inside
the file grub.cfg)

menuentry "Custom Graphical Debian Installer" {
  linux  /d-i/gtk/vmlinuz file=/cdrom/preseed/preseed.cfg auto=true
video=vesa:ywrap,mtrr vga=788 "${loopback}"
  initrd /d-i/gtk/initrd.gz
}

anyway,I don't know if it's correct to use something like this in the
ISOLINUX/menu.cfg file :

LABEL Custom Graphical Debian Installer
  SAY "Booting Custom Graphical Debian Installer..."
  linux /d-i/gtk/vmlinuz
  APPEND boot=casper file=/cdrom/preseed/preseed.cfg auto=true
initrd=/d-i/gtk/initrd.gz append video=vesa:ywrap,mtrr vga=788

the APPEND parameter that you see was there by default. Is that correct ?
Otherwise,is something like this ok ?

linux /d-i/gtk/vmlinuz boot=casper file=/cdrom/preseed/preseed.cfg
auto=true initrd=/d-i/gtk/initrd.gz append video=vesa:ywrap,mtrr vga=788


Il giorno gio 13 ott 2022 alle ore 18:00 Thomas Schmitt <scdbac...@gmx.net>
ha scritto:

> Hi,
>
> Mario Marietto wrote:
> > ... > menuentry "Debian Custom Graphical Debian Installer" {
> > ... >   linux  /d-i/gtk/vmlinuz APPEND file=/cdrom/preseed/preseed.cfg
> auto=true video=vesa:ywrap,mtrr vga=788 "${loopback}"
> > ... >  initrd /d-i/gtk/initrd.gz
>
> > If I remove the argument APPEND,the only other chance that I have to pass
> > the preseed file is to add it inside the initrd file.
>
> To my understanding this passing is achieved by argument
>    file=/cdrom/preseed/preseed.cfg
> with no need for a preceeding argument "APPEND".
>
>
> > If you will read on the preseed tab on cubic
>
> For that i'd need to know where this tab is.
>
>
> > they suggest to prefix the preseed
> > file with the word "cdrom" in the boot configuration.
>
> If it works for you then it's a good hint for others.
>
>
> > And I don't understand why you are talking about ISOLINUX,
>
> Because "APPEND" in a separate line is a SYSLINUX/ISOLINUX configuration
> directive and because you wrote on Tue, 11 Oct 2022 23:17:39 +0200:
>
> > ... > I'm trying to modify them as follows :
> > ... > isolinux/menu.cfg
> > ... > LABEL English (en)
> > ... >   SAY "Booting English (en)..."
> > ... >   linux /live/vmlinuz boot=casper APPEND
> file=/cdrom/preseed/preseed.cfg
>
> This is the configuration file for ISOLINUX which boots on legacy BIOS.
>
> (I think it is wrong by not giving APPEND an own line, so that ISOLINUX
>  would recognize it as configuration directive. See
>    https://wiki.syslinux.org/wiki/index.php?title=Config
> )
>
>
> On Tue, 11 Oct 2022 12:02:47 +0200 you wrote:
> > ... > I would like to be helped by Thomas,because I trust
> > ... > in his high level of skills.
>
> Now i want to improve my skills by learning what exactly did the
> trick for you. So i ask for the favor that you test whether "APPEND" is
> needed for success.
> (And further i ask for the favor to give me a link to that Cubic preseed
>  documentation.)
>
>
> Have a nice day :)
>
> Thomas
>
>

-- 
Mario.

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