package grub-efi-amd64-signed 1.142.6+2.04-1ubuntu26.4 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 128

[Eduardo D. Dequilla]

During a recent update it is always looking for a non-existing EFI partition but the EFI partition is sda5 FAT32. When I continue there will be a grub error causing Kernel panic in the next boot.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: grub-efi-amd64-signed 1.142.6+2.04-1ubuntu26.4
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu Sep 24 20:48:19 2020
ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 128
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.142.6+2.04-1ubuntu26.4 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 128
UpgradeStatus: No upgrade log present (probably fresh install)