[Bug 1869558] Re: after the update of "grub-efi-amd64-signed 1.93.16+2.02-2ubuntu8.15" ubuntu doesn't boot

[dabfus]

The issue may be related to an update of "linux-firmware" package.
Laptop is a Latitude E7450 (062E) with Dell BIOS A13 version in Secure Boot mode.

lsb_release -rd
Description:    Ubuntu 18.04.4 LTS
Release:        18.04

Update of grub-efi-amd64-signed package:
Paramétrage de grub-efi-amd64-signed (1.93.16+2.02-2ubuntu8.15) ...
Installation pour la plate-forme x86_64-efi.
Could not delete variable: Invalid argument
grub-install : erreur : efibootmgr n'a pas réussi à enregistrer l'entrée de démarrage: Bloc de périphérique requis.
(translation: efibootmgr failed to register the boot entry: Block device required.)

@tormec: when you say you have to enter "Recovery Mode", is it a
suggested option following a reboot?

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https://bugs.launchpad.net/bugs/1869558

Title:
  after the update of "grub-efi-amd64-signed 1.93.16+2.02-2ubuntu8.15"
  ubuntu doesn't boot

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  After the installation of the new version of this package, the system
  doesn't boot. I have to enter in "Recovery Mode".

  $ lsb_release -rd
  Description:	Ubuntu 18.04.4 LTS
  Release:	18.04

  $ apt-cache policy grub-efi-amd64-signed
  grub-efi-amd64-signed:
    Installed: 1.93.16+2.02-2ubuntu8.15
    Candidate: 1.93.16+2.02-2ubuntu8.15
    Version table:
   *** 1.93.16+2.02-2ubuntu8.15 500
          500 http://it.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1.93+2.02-2ubuntu8 500
          500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

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