package grub-efi-amd64-signed 1.155+2.04-1ubuntu35 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Carl Barks]

Update to Ubuntu 20.04.1

This bug was found when re-installing ubuntu due to a failed update to 20.04.1

The Display drivers didn't work for Nvidia GE graphic card for Samsung 3440x1440 resolution

carl@LenovoDesk-H530s:~$ lspci | grep -i nvid
01:00.0 VGA compatible controller: NVIDIA Corporation GK208 [GeForce GT 720] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GK208 HDMI/DP Audio Controller (rev a1)

Tried various settings with cvt and xrandr but unable to get 3440x1440 resolution

Re-installed with 20.1 and problem persists with display persist and also has this bug on new install.

carl@LenovoDesk-H530s:~$ lsb_release -rd
Description: Ubuntu Groovy Gorilla (development branch)
Release: 20.10

carl@LenovoDesk-H530s:~$ sudo apt-cache policy grub-efi-amd64-signed
grub-efi-amd64-signed:
  Installed: 1.155+2.04-1ubuntu35
  Candidate: 1.155+2.04-1ubuntu35
  Version table:
 *** 1.155+2.04-1ubuntu35 500
        500 http://gb.archive.ubuntu.com/ubuntu groovy/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Package
DistroRelease: Ubuntu 20.10
Package: grub-efi-amd64-signed 1.155+2.04-1ubuntu35
ProcVersionSignature: Ubuntu 5.8.0-20.21-generic 5.8.10
Uname: Linux 5.8.0-20-generic x86_64
ApportVersion: 2.20.11-0ubuntu48
Architecture: amd64
CasperMD5CheckResult: skip
Date: Wed Oct 7 18:43:21 2020
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2020-10-07 (0 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Beta amd64 (20200930)
Python3Details: /usr/bin/python3.8, Python 3.8.6, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.20.5ubuntu2
 apt 2.1.10
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.155+2.04-1ubuntu35 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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