2

I have run Boot Repair on my machine and then rebooted my machine with my Live USB out.

From this point, I was first presented with a screen that said

1) "Shim UEFI Key Management" then was presented with

2) Boot Manager screen with two options: a) Unknown Device and b) Windows Boot Manager. Selected "Unknown Device" as option (b) did nothing.

3) After this, saw a GRUB ver 2.02 screen with the first option of *Ubuntu, which then eventually got me into Ubuntu.

The above sequence of steps occurs everytime I reboot my machine.

Why all these steps?

FYI, here is my boot-repair info: http://paste.ubuntu.com/10562192/

You will notice that on lines: 549, 741 and 776, I am getting the line:

Boot0000* Unknown Device:   HD(1,800,100000,aa8f4a18-e5fc-41ff-bb2d-826eab7312c9)File(EFIubuntushimx64.efi)RC

Would this be the reason I am getting the "Unknown Device" in my Boot Manager?

Thanks.

tonyf
  • 2,637

1 Answers1

0

The "Shim UEFI Key Management" screen is probably MokManager, which manages Secure Boot keys used by the Shim program. Shim is a signed pre-GRUB boot loader whose job is to enable Linux to boot on a computer that uses Secure Boot. Secure Boot is a complex topic; see my page on the subject (or many other pages; Google to find a selection) for more details.

The fact that you're seeing the same MokManager screen pop up on every boot means that either you're not registering a key or your firmware is forgetting them. If you're able to get into Ubuntu without registering a key, then my suspicion is that you've got at least two Linux boot paths registered; one is failing and then the other is launching. If you do register a key, then as I said, your firmware is forgetting them.

Posting your Boot Repair pastebin file would be helpful, yes.

Rod Smith
  • 45,120
  • 7
  • 66
  • 108