Windows 10 device not found in a dual boot with Ubuntu 18.04 on separate disk
I have Windows 10 & Ubuntu 18.04 installed on their own disk.
- Windows 10 is installed on
sdawith it's own EFI partition on/dev/sda1 - Ubuntu 18.04 is installed on
sdbwith it's own EFI partition on/dev/sdb1 - BIOS is configured to boot
sdb.
Once I reach the grub2 menu I can boot Ubuntu with no problems, but if I try to boot Windows Windows Boot Manager (/dev/sda1/) I get a device not found error and it goes back to the grub2 menu. If I force boot sda from BIOS. I can boot Windows with no problems.
So both boot/EFI works on their own, the problem seems to be grub unable to located the sda1 location properly?
I've tried boot-repair numerous time and it didn't help. When I run update-grub, it seems to find the Windows EFI partition but seems to never configure it properly.
This is what I get when I run update-grub:
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.15.0-20-generic
Found initrd image: /boot/initrd.img-4.15.0-20-generic
Found Windows Boot Manager on /dev/sda1@/efi/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for EFI firmware configuration
doneI've looked around but not quite sure how to proceed to make grub point to the right device/boot for Windows 10. Should I go into the current grub configuration and change the device manually, run a command that would make a new entry that point to the right place, if so what command or something else?
1 Answer
I've managed to fix it.
If, like me, you keep getting No device found errors: <UUID> when trying to boot to Windows and you are sure the menu entry points to the right partitions (Running: ls -l /dev/disk/by-uuid/ | sort --key 11 | cut -c40-).
Look in your BIOS settings and make sure that Fastboot is disabled.
