package grub-efi-amd64 2.02+dfsg1-5ubuntu8.3 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 255

[Jörgen Winther]

Appeared during normal update - after a couple of months where the computer had not been used

ProblemType: Package
DistroRelease: Ubuntu 18.10
Package: grub-efi-amd64 2.02+dfsg1-5ubuntu8.3
ProcVersionSignature: Ubuntu 4.18.0-25.26-generic 4.18.20
Uname: Linux 4.18.0-25-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.3
Architecture: amd64
Date: Thu Jul 4 20:25:37 2019
DuplicateSignature:
 package:grub-efi-amd64:2.02+dfsg1-5ubuntu8.3
 Setting up grub-efi-amd64 (2.02-2ubuntu8.12) ...
 dpkg: error processing package grub-efi-amd64 (--configure):
  installed grub-efi-amd64 package post-installation script subprocess returned error exit status 255
ErrorMessage: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 255
InstallationDate: Installed on 2017-04-17 (809 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
ProcCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-25-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
Python3Details: /usr/bin/python3.6, Python 3.6.8, python3-minimal, 3.6.7-1~18.10
PythonDetails: /usr/bin/python2.7, Python 2.7.16, python-minimal, 2.7.15-3
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu5
 apt 1.7.5
SourcePackage: grub2
Title: package grub-efi-amd64 2.02+dfsg1-5ubuntu8.3 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 255
UpgradeStatus: Upgraded to cosmic on 2019-07-04 (1 days ago)

[Launchpad Janitor (janitor)]

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