How do I read the grub configuration into a grub.cfg file, so I can edit and correct it?

[Stefan Blachmann]

Hello,

I was trying to install debian zfs-on-root.
When I tried to boot this, grub complained "i386-pc not found".
How can I read and export the grub configuration stored on the boot
partition into a grub.cfg file on a live linux, so I can look at it
and correct mistakes?

Thank you,
Stefan