Arch Linux

Tiene10

Member

Registered: 2021-04-15

Posts: 16

[Solved] Problems with Dual Boot Windows 10 Arch

Hello,

The day before yesterday, I decided to format my disks, install ArchLinux and transfer Windows from the hdd to the ssd.

The first one, nvme0n1p1, contains ArchLinux :

-an EFI partition on /dev/nvme0n1p1
-a / partition on /dev/nvme0n1p2
- a /home partition on /dev/nvme0n1p3

The second one contains windows with a classic configuration: EFI, Recovery and C.

I installed Grub in the EFI of ArchLinux because I thought Grub would boot faster if it was in the SSD.

However, after adding this code :

if [ "${grub_platform}" == "efi" ]; then
	menuentry "Windows 10" {
		insmod part_gpt
		insmod fat
		insmod search_fs_uuid
		insmod chain
		search --fs-uuid --set=root $hints_string $fs_uuid
		chainloader /EFI/Microsoft/Boot/bootmgfw.efi
	}
fi

in /etc/grub.d/40_custom,
Grub displays the Windows 10 entry correctly, but gives me the error that it cannot find /EFI/Microsoft/Boot/bootmgfw.efi

The problem is probably that Windows is not on the same disk as Linux.

Otherwise, ArchLinux works really well.

If anyone has a solution,  I'll take it.

Last edited by Tiene10 (2021-04-17 12:22:06)

Head_on_a_Stick

Member

From: London

Registered: 2014-02-20

Posts: 7,732

Website

Re: [Solved] Problems with Dual Boot Windows 10 Arch

		search --fs-uuid --set=root $hints_string $fs_uuid

Have you defined $hints_string & $fs_uuid? Do they match the string & UUID for the Windows EFI system partition? Is /EFI/Microsoft/Boot/bootmgfw.efi present on the Windows EFI system partition?

---

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Tiene10

Member

Registered: 2021-04-15

Posts: 16

Re: [Solved] Problems with Dual Boot Windows 10 Arch

No,  where I have to define $hints_string $fs_uuid?

And how can I get String and UUID of the Windows EFI Partition ?

Finally, how can I acced to the Windows EFI Partition while I am in the Arch Partition.

Because I haven't access to Windows EFI :

[tiene10@PCTiene ~]$ df -h
Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
dev                7,8G       0  7,8G   0% /dev
run                7,8G    1,6M  7,8G   1% /run
/dev/nvme0n1p2      56G    8,8G   45G  17% /
tmpfs              7,8G    3,1M  7,8G   1% /dev/shm
tmpfs              7,8G    716K  7,8G   1% /tmp
/dev/nvme0n1p3      61G    5,7G   52G  10% /home
/dev/nvme0n1p1     293M    144K  293M   1% /boot/efi
tmpfs              1,6G    120K  1,6G   1% /run/user/1000
/dev/sda3          814G     29G  786G   4% /run/media/tiene10/0CAA465DAA464404

I think these are basic questions, but I'm new to Linux.

Last edited by Tiene10 (2021-04-16 21:19:10)

Tiene10

Member

Registered: 2021-04-15

Posts: 16

Re: [Solved] Problems with Dual Boot Windows 10 Arch

Also when I look at the size of home (there is nothing in it), I have this result :

[root@PCTiene /]# ls -lah /home
total 28K
drwxr-xr-x  4 root    root    4,0K 14 avril 21:58 .
drwxr-xr-x 17 root    root    4,0K 13 avril 20:26 ..
drwx------  2 root    root     16K 13 avril 20:21 lost+found
drwx------ 17 tiene10 tiene10 4,0K 16 avril 20:34 tiene10

But when I do a df -h, I see that the partition containing home is 5.7 G.

Sorry, It is in French. 

[root@PCTiene ~]# df -h /home
Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
/dev/nvme0n1p3      61G    5,7G   52G  10% /home

How come?

Last edited by Tiene10 (2021-04-16 21:16:06)

Head_on_a_Stick

Member

From: London

Registered: 2014-02-20

Posts: 7,732

Website

Re: [Solved] Problems with Dual Boot Windows 10 Arch

where I have to define $hints_string $fs_uuid?

Either in /boot/grub/grub.cfg or in /etc/grub.d/40_custom. The latter should be preferred because any manual additions to the former will be over-written if you ever regenerate grub.cfg with the grub-mkconfig command.

As you are only calling the variables once it would be simpler to just state the values directly rather than use a variable. I've never needed a hint string so you could probably get away with just listing the UUID.

how can I get String and UUID of the Windows EFI Partition ?

Use the grub-probe command. The GRUB page on the ArchWiki explains this, did you not bother reading that before posting?

how can I acced to the Windows EFI Partition while I am in the Arch Partition

If the Windows ESP is on /dev/sda1 then use

# mount /dev/sda1 /mnt
$ find /mnt -name bootmgfw.efi

I'm new to Linux

Pro Tip: learn to use a search engine.

Sorry, It is in French.

Prepend commands with LC_ALL=C to make them speak English.

How come?

You probably have files under /home/avril/ & /home/tiene/ that are accounting for the disk usage. Use something like ncdu to confirm this. But that is off-topic for this thread. Please stick to a single query per thread.

---

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Tiene10

Member

Registered: 2021-04-15

Posts: 16

Re: [Solved] Problems with Dual Boot Windows 10 Arch

Thank you,

Just by mounting /dev/sda1, Grub recognized Windows Boot Manager and the /etc/grub.d/40_custom file was useless.

You are the boss

It works, but I don't understand something.
I have done :

umount -R /mnt

before reboot, and when I do

find / -name bootmgfw.efi

No result is displayed.
So I don't understand how Grub finds Windows boot manager when it didn't find it before.

Last edited by Tiene10 (2021-05-27 08:29:31)

Head_on_a_Stick

Member

From: London

Registered: 2014-02-20

Posts: 7,732

Website

Re: [Solved] Problems with Dual Boot Windows 10 Arch

The Windows boot manager is on the Windows EFI system partition.

---

Are you infected with Wetiko?