debian12.8 的 preseed 自动安装方式，封装 iso 的正确方式？?

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先做了这些事情(debian-12.8.0-amd64-DVD-1.iso 是官网下载的)

apt install debian-cd isolinux genisoimage
mount -o loop /opt/mkiso/debian-12.8.0-amd64-DVD-1.iso /mnt
mkdir /opt/debian_custom
cp -r /mnt/* /opt/debian_custom/
cp /opt/preseed.cfg /opt/debian_custom/preseed.cfg
chmod +w /opt/debian_custom/isolinux/txt.cfg
vi /opt/debian_custom/isolinux/txt.cfg

加入以下测试项

label autoa
  menu label ^autotesta (Automated)
  kernel /install.amd/vmlinuz
  append  auto=true preseed/file=preseed.cfg initrd=/install.amd/initrd.gz --- quiet

label autob
  menu label ^autotestb (Automated)
  kernel /install.amd/vmlinuz
  append   auto=true preseed/file=/preseed.cfg initrd=/install.amd/initrd.gz --- quiet

label autoc
  menu label ^autotestc (Automated)
  kernel /install.amd/vmlinuz
  append   auto=true preseed/file=/cdrom/preseed.cfg initrd=/install.amd/initrd.gz --- quiet

cd /opt/debian_custom

genisoimage -o /home/debian_0012_-auto.iso \
  -r -J -b isolinux/isolinux.bin -c isolinux/boot.cat \
  -no-emul-boot -boot-load-size 4 -boot-info-table \
  -eltorito-alt-boot -e boot/grub/efi.img -no-emul-boot \
  /opt/debian_custom


xorriso -as mkisofs -o /home/debian_0012_-auto.iso \
  -r -J -V "Debian Custom" \
  -b isolinux/isolinux.bin -c isolinux/boot.cat \
  -no-emul-boot -boot-load-size 8 -boot-info-table \
  -isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin \
  -eltorito-alt-boot -e boot/grub/efi.img -no-emul-boot \
  /opt/debian_custom

使用以上两种命令生成的 iso ，在虚拟机中，能正常引导，无论是传统的 Graphical Install ，还是自加的 autotesta,autotestb,autotestc 方式，在开始后，会在界面提示：Detect and mount installation media","Incorrect installation media detected"

preseed.cfg 应该是没问题的，交给 GPT 检查过，现在看起来，更像是 iso 的封装方式，安装引导无法识别介质，导致了没法继续下去了，正确姿势应该是如何？

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preseed iso 引导