[Bug 1770579] 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 2

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** Tags removed: need-duplicate-check

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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 2

Status in shim-signed package in Ubuntu:
  New

Bug description:
  This happens when I tried to setup boot key during 18.04 upgrade.  
  Exits with Error code 2

  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
  NonfreeKernelModules: nvidia_modeset nvidia
  .proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or directory: '/proc/sys/kernel/moksbstate_disabled'
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  Date: Wed May  9 20:01:47 2018
  EFITables:
   May 11 23:30:27 dheepan-tower kernel: efi: EFI v2.40 by American Megatrends
   May 11 23:30:27 dheepan-tower kernel: efi:  ESRT=0xbfed1d98  ACPI=0xbe576000  ACPI 2.0=0xbe576000  SMBIOS=0xbfed0000  SMBIOS 3.0=0xbfecf000  MPS=0xfc9e0 
   May 11 23:30:27 dheepan-tower kernel: secureboot: Secure boot disabled
   May 11 23:30:27 dheepan-tower kernel: esrt: Reserving ESRT space from 0x00000000bfed1d98 to 0x00000000bfed1dd0.
  ErrorMessage: installed shim-signed package post-installation script subprocess returned error exit status 2
  InstallationDate: Installed on 2017-11-18 (173 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  MokSBStateRT: 6   0   0   0   1
  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: 6   0   0   0   1
  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 2
  UpgradeStatus: Upgraded to bionic on 2018-05-09 (1 days ago)

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