[Bug 1855574] Re: grub-efi-amd64-signed (1.93.15+2.02-2ubuntu8.14) failed to upgrade, system unbootable

[lvm]

I finally tried rebooting the affected server, and as I expected it
wouldn't boot with 'no bootable device available', and I was able to
recover it by upgrading (admittedly ancient) BIOS (EFI) to the latest
available version.

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https://bugs.launchpad.net/bugs/1855574

Title:
  grub-efi-amd64-signed (1.93.15+2.02-2ubuntu8.14) failed to upgrade,
  system unbootable

Status in efibootmgr package in Ubuntu:
  Confirmed

Bug description:
  During the routine upgrade grub-efi-amd64-signed
  (1.93.15+2.02-2ubuntu8.14) returned an error:

  Setting up grub-efi-amd64-signed (1.93.15+2.02-2ubuntu8.14) ...
  Installing for x86_64-efi platform.
  Could not delete variable: Invalid argument
  grub-install: error: efibootmgr failed to register the boot entry: Block device required.
  dpkg: error processing package grub-efi-amd64-signed (--configure):
  installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  Errors were encountered while processing:
  grub-efi-amd64-signed
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  
  Linux server 5.0.0-36-generic #39~18.04.1-Ubuntu SMP Tue Nov 12 11:09:50 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

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