mjhjmtu

I have a Dell G3 17 3779 laptop.

It has sata HDD as hd0 and m.2 ssd as hd1. Both in GPT.

I deleted everything in the ssd and installed Windows 10.

I used 4 partitions:

• Windows recovery environment (499M) | /dev/sdb1
  


• EFI System (100M) | /dev/sdb2
  


• Microsoft reserved (MSR) (16M) | /dev/sdb3
  


• Main Windows NTFS partition (70G) | /dev/sdb4
  

Also I added for Arch Linux 2 partitions:

• For / (47.7G) | /dev/sdb5
  


• For swap (980.3M) | /dev/sdb6
  

HDD disk has 2 partitions:

• Microsoft reserved (MSR) (16M) | /dev/sda1
  


• Some NTFS (900G) | /dev/sda2
  

After Windows I installed arch linux from UEFI following the wiki manual.

GRUB was installed with the usual grub-install without keys

I tried to configure GRUB with manual config:

/boot/grub/grub.cfg

. $prefix/menu.cfg

/boot/grub/menu.cfg

set default=0
set timeout=10
menuentry "ArchLinux" 
 linux /boot/vmlinuz-linux root=/dev/sdb4 rw
 initrd /boot/initramfs-linux.img

menuentry "Windows" 
 regexp -s root '((.+))' "$cmdpath"
 chainloader /EFI/Microsoft/Boot/bootmgfw.efi

After rebooting just started Windows 10 without any boot menus.

I installed os-prober and tried grub-mkconfig and get some warning like:
WARNING: Failed to connect to lvmetad. Falling back to device scanning.

or
WARNING: Device /dev/loop0 not initialized in udev database even after waiting 10000000 microseconds.

Instead /dev/loop0 was in all partitions.

And still booting only Windows.

May be it because my HDD is first in BIOS unlike SSD (hd0 vs hd1)?

How to fix this problem?

update: this answer https://askubuntu.com/a/816347/879272 allows me to open grub.

But why BIOS started EFI/Microsoft/Boot/bootmgfw.efi ignoring another boot loaders.

Can I disable this behavior?

Several weeks ago I had the same problem on my laptop. It ignored my GRUB2 and start Windows directly. Here is how I solved this problem:

1. Rename the directory /boot/efi/EFI/Microsoft to Microsoft0
   


2. Change the path in chainloader /EFI/Microsoft/Boot/bootmgfw.efi accordingly, to /EFI/Microsoft0/Boot/bootmgfw.efi
   

It seems that the BIOS in my laptop will always put Microsoft boot loader at the top of the list, no matter how you configure it. So, renaming the Microsoft directory in the EFI partition can fool the BIOS and it won't boot into Windows automatically.

I think the BIOS is still telling the G3 to boot Windows.

The Dell BIOS has a good file browser to select the bootloader. Enter the BIOS setup (maybe F2 or F8) as soon as you see the Dell logo screen and before Windows starts. Next use the file browser to locate the bootloader grubx64.efi you want to boot and select. Then review the boot order and save the new settings to reboot to Grub.

Maybe there is something wrong with the grubx64.efi bootloader. Here is an amazing utility that can boot anything anywhere without a bootloader:

SuperGrub2