Grub dual boot error

Redhawk18 · August 10, 2024, 4:58am

Hey, I’m trying to dual boot and I’m having issues getting grub to work properly

updating GRUB 2 menu...
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
lsblk: /dev/mapper/no*[0-9]: not a block device
lsblk: /dev/mapper/raid*[0-9]: not a block device
lsblk: /dev/mapper/disks*[0-9]: not a block device
Found Windows Boot Manager on /dev/sda1@/efi/Microsoft/Boot/bootmgfw.efi
installing the GRUB 2 boot loader on /dev/sda ...
Installing for i386-pc platform.
/nix/store/2d55x0liscvba4isa4shfff48py5c3bx-grub-2.12/sbin/grub-install: error: cannot find a GRUB drive for /dev/sda .  Check your device.map.
/nix/store/nimksw3aan1md9djl78vz7nbgfa5cmdr-install-grub.pl: installation of GRUB on /dev/sda  failed: Inappropriate ioctl for device
warning: error(s) occurred while switching to the new configuration

This is my code I have, I’ve tried pointing it to a parition and a device and neither seem to make it work. I’m trying to dual boot windows aswell.

  boot.loader.efi.canTouchEfiVariables = true;
  boot.loader.grub.enable = true;
  boot.loader.grub.device = "/dev/sda ";
  boot.loader.grub.useOSProber = true;
  boot.loader.grub.efiSupport = true;

Redhawk18 · August 10, 2024, 5:19am

I got it to build with the following, but one reboot later shows it doesn’t show up with grub after I commented out systemd boot.

  boot.supportedFilesystems = [ "ntfs" ];

  boot.loader.efi.canTouchEfiVariables = true;
  boot.loader.grub.enable = true;
  boot.loader.grub.device = "nodev";
  boot.loader.grub.useOSProber = true;
  boot.loader.grub.efiSupport = true;

mightyiam · August 10, 2024, 2:39pm

The grub device should probably be a partition, such as /dev/sda1. Or use more clever paths. In any case, be careful with your data. Here’s mine:

github.com

mightyiam/infra/blob/dec5c307357a3c5d6458c052cab23c646c570022/nixos-modules/modules/grub.nix

{
  fileSystems = {
    "/boot0" = {
      device = "/dev/disk/by-partlabel/boot0";
      fsType = "vfat";
      options = [
        "fmask=0022"
        "dmask=0022"
      ];
    };

    "/boot1" = {
      device = "/dev/disk/by-partlabel/boot1";
      fsType = "vfat";
      options = [
        "fmask=0022"
        "dmask=0022"
      ];
    };
  };

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Redhawk18 · August 10, 2024, 9:28pm

I got it working with systemd, the true problem was I had three boot options for linux.

uefi os m_2
Windows Boot Loader
Nixos boot
Linux Boot Loader

When I selected the 4th option Windows just showed up, I didn’t have to add anything to my config.