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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?

Zanna
  • 70,465
Dr.Kameleon
  • 233
  • Is Windows fast start up off? http://askubuntu.com/questions/843153/ubuntu-16-showing-windows-10-partitions Grub will not boot Windows if hibernated nor if it needs chkdsk. You then have to directly boot Windows (not sure if possible with Mac), not thru grub or use Windows repair disk. – oldfred Apr 26 '18 at 18:11
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    @karel you were right, this did the trick ;) – Dr.Kameleon Apr 26 '18 at 23:25

0 Answers0