dual boot – `chainloader bootmgfw.efi` does not load Windows

I have installed Ubuntu alongside with Windows 10, and they are on different disks. Since the disk containing Windows does not have a UEFI partition and uses C:/EFI/Microsoft/Boot/bootmgfw.efi to load Windows instead, grub does not recognize the Windows bootloader.

If I boot from Ubuntu install USB and enter the grub command line, by running the following commands I can start Windows successfully:

chainloader (hd1,msdos1)/EFI/Microsoft/Boot/bootmgfw.efi

However, if I enter the grub command line of the installed Ubuntu on disk, when I run:

chainloader (hd1,msdos1)/EFI/Microsoft/Boot/bootmgfw.efi

it print Error: invalid signature. If I add --force option to chainloader and then boot, the screen goes blank and windows does not start up.

Can anyone give some suggestions on how to boot Windows from Ubuntu grub?

Read more here: Source link