[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

[patrick]

Hi, I had the same bug since summer 2018. But for me, the following fixed the problem:
The bug was caused by a "no space left on device error" on the "efi firmware". There was a hint in the apt log.
So a colleague of mine (https://launchpad.net/~aburch) gave me the tip to delete dump files in

/sys/firmware/efi/efivars

There where hundred of files starting with "dump" and I removed only these!
This fixed it immediately. 

Can someone confirm that deleting these files is save? Is that the
trigger of the general bug?

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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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