Alex Kost:
> OK, just to make sure could you also look if this gives your "rootfs"
> label:
> 
>   # e2label /dev/sdaN

That did. I checked with cfdisk, and the boot flag is on. cfdisk also
showed the partition label. The disk label/table came as dos.

> there is no any "vmlinuz"
> in GuixSD.  IIUC this error appears after grub tried to boot one of its
> entries, right?

I need to do this:
https://libreboot.org/docs/gnulinux/grub_cbfs.html#option1_dont_reflash
-- 
https://emailselfdefense.fsf.org
Key fingerprint = D7E9 5431 9C95 097F C314  C2A2 DD8C 15BD 0168 5E3A