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