[Bug 1767025] Re: package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1

[Kontodimas Konstantinos]

OK I managed to fix the issue by using this method:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1734147. The
problem had probably occurred in 17.10, but since there was no need for
an update to EFI entries and I haven't tried to access the BIOS setup
for a long time, I didn't notice it.

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https://bugs.launchpad.net/bugs/1767025

Title:
  package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade:
  installed shim-signed package post-installation script subprocess
  returned error exit status 1

Status in shim-signed package in Ubuntu:
  Invalid

Bug description:
  Message came after upgrade to Ubuntu 18.04 LTS (bionc beaver)

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: shim-signed 1.34.9+13-0ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  .proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/proc/sys/kernel/moksbstate_disabled'
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  Date: Thu Apr 26 06:16:25 2018
  EFITables:
   Apr 26 06:25:53 GoldenPhoenix kernel: efi: EFI v2.31 by American Megatrends
   Apr 26 06:25:53 GoldenPhoenix kernel: efi:  ACPI=0xbc195000  ACPI 2.0=0xbc195000  SMBIOS=0xf04c0  MPS=0xfd500 
   Apr 26 06:25:53 GoldenPhoenix kernel: secureboot: Secure boot could not be determined (mode 0)
   Apr 26 06:26:33 GoldenPhoenix fwupd[2627]: disabling plugin because: failed to startup uefi: UEFI firmware updating not supported
  ErrorMessage: installed shim-signed package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2017-12-15 (131 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu2
   apt  1.6.1
  SecureBoot: 22   0   0   0   0
  SourcePackage: shim-signed
  Title: package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to bionic on 2018-04-26 (0 days ago)

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