Attempting to install GuixSD as I have before (upgrading to address@hidden was being finicky, so I decided to just do a full fresh install), but today I encounter this:
> grub-install: error: /gnu/store/..grub-2.02/lib/grub/x86_64-efi/modinfo.sh doesn't exist. Please specify --target or --directory.
> guix system: error: failed to install GRUB on device '/dev/sda'
/dev/sda is GPT.