[Bug 1795807] Re: package grub-efi-amd64-signed 1.93.7+2.02-2ubuntu8.6 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[G'kar]

Same for me ... and it's nearly each upgrade.
I'm using an XPS 13 9343 (2015)

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Title:
  package grub-efi-amd64-signed 1.93.7+2.02-2ubuntu8.6 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:
  Description:	Ubuntu 18.04.1 LTS
  Release:	18.04

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64-signed 1.93.7+2.02-2ubuntu8.6
  ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
  Uname: Linux 4.15.0-36-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
  Date: Wed Oct  3 09:14:18 2018
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2016-05-14 (871 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu2
   apt  1.6.5
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.93.7+2.02-2ubuntu8.6 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to bionic on 2018-09-28 (4 days ago)

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