So, let me explain my setup a bit.
I have a MacBook Pro (Early 2011) which I dual booted (Windows 10 and Mac OS). Then I decided I also needed Ubuntu, which I installed on an external disk.
And here's where things turned messy.
When the mac boots up, after pressing the Option button, I can see two options:
- One to load Mac OS (which works fine)
- "EFI Boot"
Selecting "EFI Boot" brings up GRUB, with the following options:
- Ubuntu
- Windows 10 (at /dev/sda1)
If I select Ubuntu it works fine.
If I select Windows 10, after a while, it throws me the message File /efi/microsoft/boot/bootmgfw.efi not found
I've read a few posts on the subject, and many suggested running grub-update from Ubuntu.
However, the weird thing is, grub-update seems to recognize Windows. It just doesn't work when selected from the boot menu.
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.13.0-21-generic
Found initrd image: /boot/initrd.img-4.13.0-21-generic
Found Windows Boot Manager on /dev/sda1@/efi/Microsoft/Boot/bootmgfw.efi
done
What's going on? Any ideas?
