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#1 2022-02-13 18:00:28

mohammadreza99a
Member
Registered: 2022-02-13
Posts: 10

Grub does not detect Windows UEFI but efibootmgr finds it

This problem is getting kind of repetitive but I couldn't actually find a solution to my specific problem. I have installed Arch along side Windows and I have made a FAT32 partition which host Grub and Windows boot loader. The problem is that when I run efibootmgr, the Windows shows up but when I run os-prober, there is nothing and hence my grub can't detect Windows boot loader. I can boot into Windows only if I put my BIOS priority to Windows. I have checked and I have Windows installed with UEFI. Does anybody know what could be the cause of this problem?

Here are some outputs.

For efibootmgr I get:

BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 2001,0001,0003,2002,2003
Boot0001* Arch_Linux	HD(1,GPT,576e6cae-b67b-584b-886d-aa127636a7cc,0x800,0x82000)/File(\EFI\Arch_Linux\grubx64.efi)
Boot0003* Windows Boot Manager	HD(1,GPT,576e6cae-b67b-584b-886d-aa127636a7cc,0x800,0x82000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)RC
Boot2001* EFI USB Device	RC
Boot2002* EFI DVD/CDROM	RC
Boot2003* EFI Network	RC

For lsblk I get:

NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
nvme0n1     259:0    0 953.9G  0 disk 
├─nvme0n1p1 259:1    0   260M  0 part /boot/efi
├─nvme0n1p2 259:2    0 300.6G  0 part /run/media/mohammadreza/Windows
├─nvme0n1p3 259:3    0   251G  0 part /run/media/mohammadreza/Partition1
├─nvme0n1p4 259:4    0   151G  0 part /run/media/mohammadreza/Partition2
├─nvme0n1p5 259:5    0   150G  0 part /
├─nvme0n1p6 259:6    0    93G  0 part /home
└─nvme0n1p7 259:7    0     8G  0 part [SWAP]

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#2 2022-02-13 21:01:18

Head_on_a_Stick
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From: Belsize Park
Registered: 2014-02-20
Posts: 8,161
Website

Re: Grub does not detect Windows UEFI but efibootmgr finds it

Did you enable os-prober in /etc/default/grub? See also https://wiki.archlinux.org/title/GRUB#MS_Windows

If you can't get os-prober working then see https://wiki.archlinux.org/title/GRUB#W … I/GPT_mode for a stanza that can be added to either /boot/grub/custom.cfg or /etc/grub.d/40_custom (the latter location needs grub-mkconfig for it to be added to the menu).

"Austerity is the idea that the global financial crash of 2008 was caused by there being too many libraries in Wolverhampton."
   — Alexei Sayle

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#3 2022-02-13 22:50:23

mohammadreza99a
Member
Registered: 2022-02-13
Posts: 10

Re: Grub does not detect Windows UEFI but efibootmgr finds it

os-prober was enabled by default in /etc/default/grub. I have tried to add manually the Windows boot loader to grub but it does not work. Could it be related to some kind of mount issues?

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#4 2022-02-15 06:37:14

Head_on_a_Stick
Member
From: Belsize Park
Registered: 2014-02-20
Posts: 8,161
Website

Re: Grub does not detect Windows UEFI but efibootmgr finds it

How exactly did you attempt to manually add the Windows menuentry? Please post the configuration file that was added or edited and also the full content of /boot/grub/grub.cfg,

Please also share the output of

# blkid

"Austerity is the idea that the global financial crash of 2008 was caused by there being too many libraries in Wolverhampton."
   — Alexei Sayle

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#5 2022-02-17 11:35:31

mohammadreza99a
Member
Registered: 2022-02-13
Posts: 10

Re: Grub does not detect Windows UEFI but efibootmgr finds it

Here is the output of 

blkid
/dev/nvme0n1p7: UUID="522fb482-ee75-40c8-9819-d0078a04c71f" TYPE="swap" PARTUUID="443d2b6c-d02d-564b-ac4c-38062f147832"
/dev/nvme0n1p5: UUID="fc20a978-2012-456d-8a38-debbddc18320" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="260fd788-e554-554d-9659-cec33efe8f16"
/dev/nvme0n1p3: LABEL="Partition1" BLOCK_SIZE="512" UUID="A4EC3CE6EC3CB500" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="87f2f298-8c1e-41b8-9d28-3d65efa000cb"
/dev/nvme0n1p1: LABEL_FATBOOT="NO_LABEL" LABEL="NO_LABEL" UUID="E23D-EDCC" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="576e6cae-b67b-584b-886d-aa127636a7cc"
/dev/nvme0n1p6: UUID="0e15e6f2-5842-4f47-a24e-b04c51f1f07e" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="8e420e0c-19e6-6048-a0f8-0d79e82fa411"
/dev/nvme0n1p4: LABEL="Partition2" BLOCK_SIZE="512" UUID="A0507F78507F53CE" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="756fa30e-9fa5-42c1-88f5-4843d5e30960"
/dev/nvme0n1p2: LABEL="Windows" BLOCK_SIZE="512" UUID="9E9044E49044C50D" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="6e3de74a-3ed0-4bcb-a711-acf4adb4f13b"

To add the entry menu for windows, I put blew code into 

/etc/grub.d/40_custom

:

 
#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
if [ "${grub_platform}" == "efi" ]; then
	menuentry "Microsoft Windows Vista/7/8/8.1 UEFI/GPT" {
		insmod part_gpt
		insmod fat
		insmod chain
		search --no-floppy --fs-uuid --set=root $hints_string $fs_uuid
		chainloader /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi
	}
fi

and after this i ran the command 

grub-mkconfig

and here is the content of my 

/boot/grub/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
insmod part_gpt
insmod part_msdos
if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="0"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_gpt
insmod ext2
search --no-floppy --fs-uuid --set=root fc20a978-2012-456d-8a38-debbddc18320
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_input console
terminal_output gfxterm
insmod part_gpt
insmod ext2
search --no-floppy --fs-uuid --set=root fc20a978-2012-456d-8a38-debbddc18320
insmod gfxmenu
loadfont ($root)/usr/share/grub/themes/Vimix/dejavu_32.pf2
loadfont ($root)/usr/share/grub/themes/Vimix/dejavu_sans_12.pf2
loadfont ($root)/usr/share/grub/themes/Vimix/dejavu_sans_14.pf2
loadfont ($root)/usr/share/grub/themes/Vimix/dejavu_sans_16.pf2
loadfont ($root)/usr/share/grub/themes/Vimix/dejavu_sans_24.pf2
loadfont ($root)/usr/share/grub/themes/Vimix/dejavu_sans_48.pf2
loadfont ($root)/usr/share/grub/themes/Vimix/terminus-12.pf2
loadfont ($root)/usr/share/grub/themes/Vimix/terminus-14.pf2
loadfont ($root)/usr/share/grub/themes/Vimix/terminus-16.pf2
loadfont ($root)/usr/share/grub/themes/Vimix/terminus-18.pf2
insmod jpeg
insmod png
set theme=($root)/usr/share/grub/themes/Vimix/theme.txt
export theme
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-fc20a978-2012-456d-8a38-debbddc18320' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_gpt
	insmod ext2
	search --no-floppy --fs-uuid --set=root fc20a978-2012-456d-8a38-debbddc18320
	echo	'Loading Linux linux ...'
	linux	/boot/vmlinuz-linux root=UUID=fc20a978-2012-456d-8a38-debbddc18320 rw  quiet resume=UUID=522fb482-ee75-40c8-9819-d0078a04c71f loglevel=3 audit=0
	echo	'Loading initial ramdisk ...'
	initrd	/boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-linux.img
}
submenu 'Advanced options for Arch Linux' $menuentry_id_option 'gnulinux-advanced-fc20a978-2012-456d-8a38-debbddc18320' {
	menuentry 'Arch Linux, with Linux linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-fc20a978-2012-456d-8a38-debbddc18320' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_gpt
		insmod ext2
		search --no-floppy --fs-uuid --set=root fc20a978-2012-456d-8a38-debbddc18320
		echo	'Loading Linux linux ...'
		linux	/boot/vmlinuz-linux root=UUID=fc20a978-2012-456d-8a38-debbddc18320 rw  quiet resume=UUID=522fb482-ee75-40c8-9819-d0078a04c71f loglevel=3 audit=0
		echo	'Loading initial ramdisk ...'
		initrd	/boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-linux.img
	}
	menuentry 'Arch Linux, with Linux linux (fallback initramfs)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-fallback-fc20a978-2012-456d-8a38-debbddc18320' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_gpt
		insmod ext2
		search --no-floppy --fs-uuid --set=root fc20a978-2012-456d-8a38-debbddc18320
		echo	'Loading Linux linux ...'
		linux	/boot/vmlinuz-linux root=UUID=fc20a978-2012-456d-8a38-debbddc18320 rw  quiet resume=UUID=522fb482-ee75-40c8-9819-d0078a04c71f loglevel=3 audit=0
		echo	'Loading initial ramdisk ...'
		initrd	/boot/intel-ucode.img /boot/amd-ucode.img /boot/initramfs-linux-fallback.img
	}
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
menuentry 'UEFI Firmware Settings' $menuentry_id_option 'uefi-firmware' {
	fwsetup
}
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg
fi
### END /etc/grub.d/41_custom ###

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#6 2022-02-17 11:45:14

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 22,803

Re: Grub does not detect Windows UEFI but efibootmgr finds it

You need to actually write out the entry to standard out e.g. 

echo 'menuentry "Microsoft Windows Vista/7/8/8.1 UEFI/GPT" {
		insmod part_gpt
		insmod fat
		insmod chain
		search --no-floppy --fs-uuid --set=root $hints_string $fs_uuid
		chainloader /EFI/Microsoft/Boot/bootmgfw.efi
	}'

Note that i dropped the /boot/efi from the chainloader line because you need to write paths relative to the ESP root.

Also grub-mkconfig without the -o argument will write to stdout, make sure you properly write the correct config file as well.

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#7 2022-02-17 14:54:52

mohammadreza99a
Member
Registered: 2022-02-13
Posts: 10

Re: Grub does not detect Windows UEFI but efibootmgr finds it

I did this and the problem is that when I click on the Windows entry in grub menu, it says that this path does not exist. Why this is happening? Because I can enter to Windows if I just change boot orders in my BIOS. Is this happening because the Windows boot loader is not correctly put into the correct path ?

Here is the content of my /boot/ folder:

drwx------    - root  1 Jan  1970  efi
drwxr-xr-x    - root 17 Feb 15:51  grub
.rw-r--r--  51k root 10 Feb 14:22  amd-ucode.img
.rw-------  24M root 16 Feb 22:07  initramfs-linux-fallback.img
.rw------- 6.8M root 16 Feb 22:06  initramfs-linux.img
.rw-r--r-- 4.7M root  8 Feb 22:07  intel-ucode.img
.rw-r--r--  10M root 16 Feb 22:05  vmlinuz-linux

Last edited by mohammadreza99a (2022-02-17 14:59:10)

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#8 2022-02-17 15:14:22

Head_on_a_Stick
Member
From: Belsize Park
Registered: 2014-02-20
Posts: 8,161
Website

Re: Grub does not detect Windows UEFI but efibootmgr finds it

V1del wrote:

You need to actually write out the entry to standard out.

No, the stanza can be added directly, as stated on the linked ArchWiki page.

mohammadreza99a wrote:

when I click on the Windows entry in grub menu, it says that this path does not exist.

Please share the updated /boot/grub/grub.cfg that contains the Windows entry.

Did you replace $hints_string & $fs_uuid with the actual, correct string & UUID? The ArchWiki page shows how to do that.

mohammadreza99a wrote:

Is this happening because the Windows boot loader is not correctly put into the correct path ?

Check under /boot/efi and see if /EFI/Mircosoft/Boot/bootmgfw.efi is present. It should be there, the Arch & Windows NVRAM entries are both using the same PARTUUID (/dev/nvme0n1p1).

"Austerity is the idea that the global financial crash of 2008 was caused by there being too many libraries in Wolverhampton."
   — Alexei Sayle

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#9 2022-02-17 17:15:11

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 22,803

Re: Grub does not detect Windows UEFI but efibootmgr finds it

@HoaS if you directly edit /boot/grub.cfg sure, if you intend /etc/grub.d/40_custom to be picked up by grub-mkconfig you'll definitely need to echo out the intended text somewhere.  But still yes, the correct replacement variables have to be replaced anyway.

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#10 2022-02-17 17:23:00

Head_on_a_Stick
Member
From: Belsize Park
Registered: 2014-02-20
Posts: 8,161
Website

Re: Grub does not detect Windows UEFI but efibootmgr finds it

V1del wrote:

if you intend /etc/grub.d/40_custom to be picked up by grub-mkconfig you'll definitely need to echo out the intended text somewhere

Nope:

archie:~$ cat /etc/grub.d/40_custom                      
#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
menuentry "Microsoft Windows Vista/7/8/8.1 UEFI/GPT" {
		insmod part_gpt
		insmod fat
		insmod chain
		search --no-floppy --fs-uuid --set=root $hints_string $fs_uuid
		chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
archie:~$ doas grub-mkconfig 2>/dev/null | grep -A6 Vista
menuentry "Microsoft Windows Vista/7/8/8.1 UEFI/GPT" {
		insmod part_gpt
		insmod fat
		insmod chain
		search --no-floppy --fs-uuid --set=root $hints_string $fs_uuid
		chainloader /EFI/Microsoft/Boot/bootmgfw.efi
}
archie:~$

Even 40_custom disagrees with you tongue

"Austerity is the idea that the global financial crash of 2008 was caused by there being too many libraries in Wolverhampton."
   — Alexei Sayle

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#11 2022-02-17 18:42:38

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 22,803

Re: Grub does not detect Windows UEFI but efibootmgr finds it

I stand corrected yikes

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#12 2022-02-17 19:54:06

mohammadreza99a
Member
Registered: 2022-02-13
Posts: 10

Re: Grub does not detect Windows UEFI but efibootmgr finds it

Head_on_a_Stick wrote:

Did you replace $hints_string & $fs_uuid with the actual, correct string & UUID? The ArchWiki page shows how to do that.

While running grub-probe --target=hints_string /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi in order to get$hints_string, I get this error:

grub-probe: warning: unknown device type nvme0n1.

For $fs_uuid I get a response.

I mean this is just a warning but it is weird that there is not any output.

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#13 2022-02-17 20:02:39

mohammadreza99a
Member
Registered: 2022-02-13
Posts: 10

Re: Grub does not detect Windows UEFI but efibootmgr finds it

mohammadreza99a wrote:
Head_on_a_Stick wrote:

Did you replace $hints_string & $fs_uuid with the actual, correct string & UUID? The ArchWiki page shows how to do that.

While running grub-probe --target=hints_string /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi in order to get$hints_string, I get this error:

grub-probe: warning: unknown device type nvme0n1.

So I have a fix for this issus. What i did was to copy the output in the wiki and I changed hd0 to nvme0n1 and I can finally successfully load into Windows from Grub. But the main issus always remains. The fact that os-prober is not able to find Windows loader.

Here is my /etc/grub.d/40_custom for those that might have the same issus:

#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
if [ "${grub_platform}" == "efi" ]; then
	menuentry "Microsoft Windows Vista/7/8/8.1 UEFI/GPT" {
		insmod part_gpt
		insmod fat
		insmod chain
		search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=nvme0n1,gpt1 --hint-baremetal=ahci0,gpt1 E23D-EDCC
		chainloader /EFI/Microsoft/Boot/bootmgfw.efi
	}
fi

Thank you both for helping me.

Last edited by mohammadreza99a (2022-02-17 20:02:58)

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#14 2022-02-17 20:29:41

Head_on_a_Stick
Member
From: Belsize Park
Registered: 2014-02-20
Posts: 8,161
Website

Re: Grub does not detect Windows UEFI but efibootmgr finds it

The --hint options are only needed if you have multiple partitions with the same filesystem UUID.

All I have ever needed is

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

search.fs_uuid is an alias for search --fs-uuid and the root variable is the presumed default.

"Austerity is the idea that the global financial crash of 2008 was caused by there being too many libraries in Wolverhampton."
   — Alexei Sayle

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