[root@nixos:~]# nixos-install
building the configuration in /mnt/etc/nixos/configuration.nix...
copying channel...
installing the boot loader...
setting up /etc...
updating GRUB 2 menu...
installing the GRUB 2 boot loader on /dev/sda...
Installing for i386-pc platform.
/nix/store/i2qa7wxsvyvizc1g2nsk1bnk9z0dcwrb-grub-2.02/sbin/grub-install: warning: this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
/nix/store/i2qa7wxsvyvizc1g2nsk1bnk9z0dcwrb-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/i2qa7wxsvyvizc1g2nsk1bnk9z0dcwrb-grub-2.02/sbin/grub-install: error: will not proceed with blocklists.
/nix/store/58v55cd1cvmi6nzsi1hj9jx8vhk3knpf-install-grub.pl: installation of GRUB on /dev/sda failed