package grub-efi-amd64-signed 1.167+2.04-1ubuntu44 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Michael D Wiggins]

New user, I don't know what happened. I switched from Zorin 15.3 to Ubantu 14 or 5.??

ProblemType: Package
DistroRelease: Ubuntu 20.10
Package: grub-efi-amd64-signed 1.167+2.04-1ubuntu44
ProcVersionSignature: Ubuntu 5.8.0-53.60-generic 5.8.18
Uname: Linux 5.8.0-53-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.6
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu May 13 21:19:31 2021
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
Python3Details: /usr/bin/python3.8, Python 3.8.6, python3-minimal, 3.8.6-0ubuntu1
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.20.5ubuntu2
 apt 2.1.10ubuntu0.3
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.167+2.04-1ubuntu44 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.

[Mattias Högfjäll (mutte)]

I didn't get this bug on my first install. Unfortunately I was so tired I forgot my password the instant I clicked OK so I had to immediately install again and then I got the bug.
On my first install though I got another bug which didn't appear the second install.

[Julian Andres Klode (juliank)]

It seems your EFI variable storage is malfunctioning.

It might just need some help. You can try resetting the BIOS, and rebooting a couple of times to try to trigger garbage collection in case it overflowed.

If that doesn't help, you might have to get the mainboard reflashed or exchanged by its manufacturer.

Or it might work to give up EFI boot and boot in BIOS mode using the BIOS' CSM.