[Bug 1924605] Re: Grub2 menu not loading - could not create MokListXRT

[Julian Andres Klode]

Deleting dbx is not advisable, it contains the list of revoked
certificates and binaries. The Mok* ones should be repopulated by shim
during boot, so are probably fine. You want to end up with the same
variables being back again after boot, essentially; but trigger garbage
collection in UEFI during the reboot.

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Title:
  Grub2 menu not loading - could not create MokListXRT

Status in grub2 package in Ubuntu:
  Invalid

Bug description:
  Thinkpad T430 I5-3320M
  Ubuntu 21.04 (ZFS)
  Dual boot: Ubuntu and Windows 10 on separate drives

  Steps to reproduce:

  * system update using 'apt update' in terminal. I have attached apt log file. The problem appeared after 'Start-Date: 2021-04-15  19:40:02', last entry.
  * 'zsysctl service gc -vv' - to remove unnecessary states
  * restart the system

  Outcome:

  * Grub2 menu does not show. Instead, error messages appear: 
  'Could not create MokListXRT: Out of Resources'
  'Failed to set MokListXRT: Out of Resources'
  * After 10 sec Ubuntu starts (Ubuntu was previously set as default system)

  Expected outcome:
  * Grub2 menu with Ubuntu, Windows and recovery options

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: grub-efi (not installed)
  ProcVersionSignature: Ubuntu 5.11.0-14.15-generic 5.11.12
  Uname: Linux 5.11.0-14-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu62
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Apr 15 20:13:35 2021
  InstallationDate: Installed on 2021-03-15 (31 days ago)
  InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Alpha amd64 (20210315)
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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