package grub-efi-amd64-signed 1.155.1+2.04-1ubuntu35.1 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Marco Caramaschi]

I was doing an update of the packages and this error appeared:
Errors were encountered while processing:
 grub-efi-amd64-signed
My version of Ubuntu is the 20.10

ProblemType: Package
DistroRelease: Ubuntu 20.10
Package: grub-efi-amd64-signed 1.155.1+2.04-1ubuntu35.1
ProcVersionSignature: Ubuntu 5.8.0-29.31-generic 5.8.14
Uname: Linux 5.8.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.2
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sun Nov 29 10:56:07 2020
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2019-08-11 (475 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
Python3Details: /usr/bin/python3.8, Python 3.8.6, python3-minimal, 3.8.6-0ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RebootRequiredPkgs:
 linux-image-5.8.0-7630-generic
 linux-base
RelatedPackageVersions:
 dpkg 1.20.5ubuntu2
 apt 2.1.10
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.155.1+2.04-1ubuntu35.1 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to groovy on 2020-10-31 (28 days ago)

[Launchpad Janitor (janitor)]

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

[Mandofab (mandofab)]

Reinstalling Ubuntu 20.10 and got the message right at the end