Arch Linux

twitmuck

Member

Registered: 2019-11-15

Posts: 12

[SOLVED] Grub/os-prober problems with dual booting windows and arch

I am currently trying to dual boot windows and arch. This is the output of

lsblk

NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
loop0         7:0    0 710.1M  1 loop 
sda           8:0    1  14.3G  0 disk 
├─sda1        8:1    1   809M  0 part 
└─sda2        8:2    1    15M  0 part 
nvme0n1     259:0    0 953.9G  0 disk 
├─nvme0n1p1 259:1    0   100M  0 part /boot
├─nvme0n1p2 259:2    0    16M  0 part 
├─nvme0n1p3 259:3    0   150G  0 part 
├─nvme0n1p4 259:4    0   521M  0 part 
├─nvme0n1p5 259:5    0 739.2G  0 part /
└─nvme0n1p6 259:6    0    64G  0 part [SWAP]

/dev/sda is my installation medium. I have created the final two nvme partitions to install arch linux on, the other nvme partitions are preinstalled by windows.

When I try to run

grub-mkconfig -o /boot/grub/grub.cfg

  after

grub-install

and installing and enabling

os-prober

, I get the following:

Generating grub configuration file ...
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.
grub-probe: error: cannot find a GRUB drive for /dev/sda1.  Check your device.map.
Adding boot menu entry for UEFI Firmware Settings ...
done

It seems like grub-probe thinks my windows EFI partition (nvme0n1p1) is on /dev/sda1, which is my installation medium. I am not sure how to fix this.

Here is my output of

fdisk -l

Disk /dev/nvme0n1: 953.87 GiB, 1024209543168 bytes, 2000409264 sectors
Disk model: PM981a NVMe Samsung 1024GB              
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 6D292F50-DF56-42CE-A7C1-8F78F1A80B50

Device              Start        End    Sectors   Size Type
/dev/nvme0n1p1       2048     206847     204800   100M EFI System
/dev/nvme0n1p2     206848     239615      32768    16M Microsoft reserved
/dev/nvme0n1p3     239616  314812415  314572800   150G Microsoft basic data
/dev/nvme0n1p4 1999339520 2000406527    1067008   521M Windows recovery environment
/dev/nvme0n1p5  314812416 1865027583 1550215168 739.2G Linux filesystem
/dev/nvme0n1p6 1865027584 1999339519  134311936    64G Linux swap

Partition table entries are not in disk order.


Disk /dev/sda: 14.32 GiB, 15376318464 bytes, 30031872 sectors
Disk model: Cruzer Blade    
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xbdeca99d

Device     Boot   Start     End Sectors  Size Id Type
/dev/sda1  *         64 1656831 1656768  809M  0 Empty
/dev/sda2       1656832 1687551   30720   15M ef EFI (FAT-12/16/32)


Disk /dev/loop0: 710.14 MiB, 744632320 bytes, 1454360 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Thanks!

Last edited by twitmuck (2023-02-15 12:42:53)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,248

Re: [SOLVED] Grub/os-prober problems with dual booting windows and arch

This board supports BBCode instead of markdown, please use BBCode [ code ] tags instead of markdown -- Ah you found it

Which exact grub-install command did you use?

Last edited by V1del (2023-02-10 16:08:12)

twitmuck

Member

Registered: 2019-11-15

Posts: 12

Re: [SOLVED] Grub/os-prober problems with dual booting windows and arch

This board supports BBCode instead of markdown, please use BBCode [ code ] tags instead of markdown

Which exact grub-install command did you use?

Just noticed, updated accordingly

I ran

grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=GRUB

Last edited by twitmuck (2023-02-10 16:09:09)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,248

Re: [SOLVED] Grub/os-prober problems with dual booting windows and arch

Weird, should generally work fine, can you create a manual working entry? https://wiki.archlinux.org/title/GRUB#W … I/GPT_mode

twitmuck

Member

Registered: 2019-11-15

Posts: 12

Re: [SOLVED] Grub/os-prober problems with dual booting windows and arch

Weird, should generally work fine, can you create a manual working entry? https://wiki.archlinux.org/title/GRUB#W … I/GPT_mode

When I run

grub-probe --target=hints_string /boot/EFI/Microsoft/Boot/bootmgfw.efi

I get

 warning: unknown device type nvme0n1

Head_on_a_Stick

Member

From: The Wirral

Registered: 2014-02-20

Posts: 9,003

Website

Re: [SOLVED] Grub/os-prober problems with dual booting windows and arch

Don't worry about that, you only need the hints if you have two partitions with the same (filesystem) UUID.

This should work just fine:

menuentry 'Windows' {
   search.fs_uuid $uuid
   chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}

Replace $uuid with the actual UUID for the EFI system partition, which can be found with

lsblk -no uuid /dev/nvme0n1p1

---

Jin, Jîyan, Azadî

twitmuck

Member

Registered: 2019-11-15

Posts: 12

Re: [SOLVED] Grub/os-prober problems with dual booting windows and arch

That worked, thanks!

joelk

Member

Registered: 2017-04-16

Posts: 15

Re: [SOLVED] Grub/os-prober problems with dual booting windows and arch

FWIW, I just had essentially the same error, except my install media is /dev/sdf so the error was

grub-probe: error: cannot find a GRUB drive for /dev/sdf1.  Check your device.map.

Clearly, when running grub-mkconfig in the initial arch-chroot, the os-prober is not recognizing the nvme drive but looking at the installation thumbdrive instead.

The simple solution turned out to be to ignore the error, finish the base system installation, exit the chroot and reboot.  This time of course Windows is not on the grub menu.  But after booting arch from the new drive, I repeated the command

grub-mkconfig -o /boot/grub/grub.cfg

and this time it found Windows and added it to the grub menu.