[Bug 1753518] Re: package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Andrei Borzenkov]

And I just had exactly the same problem (failure to modify EFI variable)
during update of secureboot-db and again running postinstall script
immediately after reboot worked OK.

Silence is becoming ridiculous. What we need is kernel with verbose
debug output about handling EFI variables. Right now it is not even
clear whether failure is returned by kernel or firmware.

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Title:
  package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 1

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  thierry at ingatech-XPS-13-9343:~$ LC_ALL=C sudo apt dist-upgrade 
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Calculating upgrade... Done
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  1 not fully installed or removed.
  After this operation, 0 B of additional disk space will be used.
  Do you want to continue? [Y/n] 
  Setting up grub-efi-amd64-signed (1.93+2.02-2ubuntu8) ...
  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)

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64-signed 1.93+2.02-2ubuntu8
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  Date: Mon Mar  5 15:49:17 2018
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2017-11-17 (107 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  Python3Details: /usr/bin/python3.6, Python 3.6.4+, python3-minimal, 3.6.4-1
  PythonDetails: /usr/bin/python2.7, Python 2.7.14+, python-minimal, 2.7.14-4
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu1
   apt  1.6~alpha7ubuntu2
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to bionic on 2018-03-01 (3 days ago)

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