[Bug 1924605] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for shim has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1924605

Title:
  Grub2 menu not loading - could not create MokListXRT: Out of Resources

Status in shim package in Ubuntu:
  Fix Released
Status in shim source package in Xenial:
  Fix Committed
Status in shim source package in Focal:
  Fix Committed
Status in shim source package in Hirsute:
  Fix Released

Bug description:
  [Impact]
  Systems fail to mirror MokListXRT. We've taken measures to reduce the size of the variable, and also made one spot non-fatal when running on non-secureboot systems that was fatal before which should address those issues. Also see related bug 1928434.

  [Test plan]
  We do not have tests to verify this

  [Where problems could occur]
  See bug 1928434; and also the point where we make it non-fatal only changes code path on non-secureboot systems, so there is an easier workaround if they fail to boot anyway. Although, it literally just adds an `|| efi_status == EFI_OUT_OF_RESOURCES` as non-fatal condition.

  [Original bug report]

  
  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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