installing the GRUB 2 boot loader on /dev/sda...
Installing for i386-pc platform.
/nix/store/67nrc9srnpab6x3zrlprqi4al74pkb0k-grub-2.02/sbin/grub-install: warning: this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
/nix/store/67nrc9srnpab6x3zrlprqi4al74pkb0k-grub-2.02/sbin/grub-install: warning: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged..
/nix/store/67nrc9srnpab6x3zrlprqi4al74pkb0k-grub-2.02/sbin/grub-install: error: will not proceed with blocklists.
/nix/store/yvg8cplwgj0z8j2x4fdix4bjwgcmwi8h-install-grub.pl: installation of GRUB on /dev/sda failed