[Bug 1925010] Re: shim-signed 15.4 does not boot on EFI 1.10 systems

[HouseSessions]

For your information, I have an HP EliteBook 840 G2, I did a fresh
install of 21.04 and had the same issue, it uses an "EFI v2.31 by HPQ".

I used following work around which worked.

What made the trick was the following changes in the BIOS Setup (after computer start push F10 - go to System Configuration - open Boot Options):
Check Customized Boot
Check off SecureBoot
Boot Mode: choose UEFI Hybrid or UEFI Native (I chose UEFI Native)
UEFI Boot Order: put Customized Boot to the top
Define Customized Boot Option: choose Add + put the setting: \EFI\ubuntu\grubx64.efi

Source: https://askubuntu.com/questions/244261/how-do-i-get-my-hp-
laptop-to-boot-into-grub-from-my-new-efi-file

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https://bugs.launchpad.net/bugs/1925010

Title:
  shim-signed 15.4 does not boot on EFI 1.10 systems

Status in shim package in Ubuntu:
  Confirmed
Status in shim-signed package in Ubuntu:
  Confirmed
Status in shim source package in Hirsute:
  In Progress
Status in shim-signed source package in Hirsute:
  In Progress

Bug description:
  The latest update on Hirsute made the MacBook Air from 2012
  unbootable.

  It could be recovered by booting a 20.04 live CD, downloading 20.04's
  shim package and overwriting the files in EFI/ubuntu and EFI/BOOT with
  the files shipped in the shim package.

  Machines Affected (not comprehensive):
  MacBookPro8,2
  MacBookAir5,2

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