[Bug 1845466] Re: UEFI/Secureboot - "Failed to start MokManager" error when trying to install 3rd party drivers during install, leading to unbootable device

[Luke Bowman]

I have a new Dell XPS 13 7390 that is experiencing this exact issue
after trying to install a fresh copy of 18.04.03. How do I recover? Is
my machine bricked? I get past the Dell logo, see the error message
described, and the machine turns off. I have played with many
combinations in the BIOS, burned several bootable images on discs, and
created several bootable USB sticks. Nothing seems to help. Please
advise.

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https://bugs.launchpad.net/bugs/1845466

Title:
  UEFI/Secureboot - "Failed to start MokManager" error when trying to
  install 3rd party drivers during install, leading to unbootable device

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Eoan:
  Fix Released

Bug description:
  Image: http://cdimage.ubuntu.com/daily-live/20190926/eoan-desktop-amd64.iso
  Device: Dell XPS 13 7390 (201908-27305)

  Note:
  - TPM2 is disabled (because of lp:1845454)
  - Secure Boot is enabled

  Install Ubuntu 19.10.
  Check the box "Install third party drivers". You'll have to input a password used by Secure Boot at the next reboot.
  Complete the installation and restart the device.

  Expected result:
  The device reboots in the MOK Management screen where you can enroll the new MOK. Then the boot process continues and you can log in Ubuntu.

  Actual result:
  The following error is shown for a few seconds, then the device turns off:

  Failed to open \EFI\ubuntu\mmx64.efi - Not Found
  Failed to load image \EFI\ubuntu\mmx64.efi: Not Found
  Failed to start MokManager: Not Found
  Something has gone seriously wrong: import_mok_state() failed: Not Found

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