I see “grub” under /nix/store. But nix-env -q by root user shows nothing.
What is the way to manage “grub”?
nix-env is used to manage user environments (including root’s).
grub is gonna be managed by your /etc/nixos/configuration.nix. It doesn’t necessarily need to be listed in systemPackages, some programs are installed solely based on some configuration option or simply as a dependency of NixOS itself. In your case you will probably have something like boot.loader.grub.* set in your configuration.nix
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