Arch Linux

Lucad

Member

Registered: 2022-01-21

Posts: 1

Dual Boot with Windows 10: Adding Windows to grub

So I've installed both Arch and Windows 10 (installed win first), but I can't manage to add Windows to grub. As I read on the wiki/other forum posts, I should mount the windows boot partition to /mnt/windows, after having created the folder ofc. But I can't do that because Windows is hybernated apparently (and not like turned off completely), and the output that I get when I execute mount /dev/sda2 /mnt/windows is:

Falling back to read-only mount because the NTFS partition is in an
unsafe state. Please resume and shutdown Windows fully (no hibernation
or fast restarting.)
Could not mount read-write, trying read-only)

I read that to fix this I have to disable fast startup, but I cant log on Windows. Are there any solutions?

My current partition set is this (yes the EFI partition is in common between win and arch):

Device                Size Type
    /dev/sda1                      16M Microsoft reserved                                           
    /dev/sda2                      332.2G Microsoft basic data
    /dev/sda3                      2G EFI System
    /dev/sda4                      509M Windows recovery environment
    /dev/sda5                      302.8G Linux filesystem (root)
    /dev/sda6                      293.9G Linux filesystem (home)

Last edited by Lucad (2022-01-21 22:57:42)

Head_on_a_Stick

Member

From: London

Registered: 2014-02-20

Posts: 7,732

Website

Re: Dual Boot with Windows 10: Adding Windows to grub

mount /dev/sda2 /mnt/windows

For a UEFI system the EFI system partition (/dev/sda3) should be mounted so that os-prober can find the Windows EFI loader (bootmgfw.efi).

FWIW this should add a menuentry for Windows without needing to use os-prober:

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

Replace $uuid with the actual UUID of the EFI system partition and place that file at /boot/grub/custom.cfg or add the stanza to the end of /etc/grub.d/40_custom (the latter location will require running grub-mkconfig to add it to grub.cfg).

Last edited by Head_on_a_Stick (2022-01-22 00:23:12)

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