Hi,
I forgot to mention that I am working with current stable guix 1.3.0
I also tried a few things:
* Manual installation doesn't trigger the error at all, but the end result is that it won't boot like before
* an independent boot partition on top of a shared /boot/efi didn't make any difference
* Trying to install guix with the boot-grub loader rather than efi didn't work at all and the boot installed errored
But I am happy to say that (after standard guix install) adding the entry in grub manually in debian
did work:
```
menuentry "Guix" {
insmod part_gpt
insmod chain
set root='(hd0,gpt1)'
chainloader /EFI/Guix/grubx64.efi
}
```
and then running update-grub