package grub-efi-amd64-signed 1.93.13+2.02-2ubuntu8.12 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255

[Tumelo Sakuneka]

Clueless

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64-signed 1.93.13+2.02-2ubuntu8.12
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
AptOrdering:
 libglx0:amd64: Install
 libgles2:amd64: Install
 libegl1:amd64: Install
 libglvnd0:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
Date: Fri Mar 8 19:35:19 2019
DuplicateSignature:
 package:grub-efi-amd64-signed:1.93.13+2.02-2ubuntu8.12
 Setting up grub-efi-amd64-signed (1.93.13+2.02-2ubuntu8.12) ...
 dpkg: error processing package grub-efi-amd64-signed (--configure):
  installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255
InstallationDate: Installed on 2019-02-24 (12 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.1
 apt 1.6.8
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.93.13+2.02-2ubuntu8.12 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 255
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.