[Bug 1790994] Re: package grub-efi-amd64-signed 1.93.5+2.02-2ubuntu8.4 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Ying]

Update: I fixed my problem by updating the BIOS.

System: HP PAVILION 550-257NG

I was running BIOS version A0.13 and updated to version A0.20. After reboot, I ran 
sudo dpkg --configure -a

Setting up grub-efi-amd64-signed (1.93.5+2.02-2ubuntu8.4) ...
Installing for x86_64-efi platform.
Installation finished. No error reported.
Setting up shim-signed (1.34.9.2+13-0ubuntu2) ...
Installing for x86_64-efi platform.
Installation finished. No error reported.


Incidentally, for those on this particular (or similar) HP desktops, the BIOS download executable can unfortunately only be run on Windows (due to the use of an HP proprietary SoftPAQ download/extraction manager obscuring the BIOS .bin file needed), so either use your Windows partition or use a different Windows computer. After the "press any key to continue the SoftPAQ update process" command prompt screen, do press any key -- don't worry, it won't flash your other system, it would check the SSID and realize that you are not using the HP computer, then offer the possibility to create a recovery USB for applying the update to your system using the UFEI recovery options on boot.

HP-specific instructions: https://support.hp.com/us-en/product/hp-pavilion-550-200-desktop-pc-series/9259612/model/10683933/document/c00007682 
Refer to "Update the BIOS when Windows do not start" if you do not have a Windows partition. 
Step 6 in the instruction on creating a USB stick only appeared after I pressed a key on the "continue the SoftPAQ update process" command prompt screen.

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https://bugs.launchpad.net/bugs/1790994

Title:
  package grub-efi-amd64-signed 1.93.5+2.02-2ubuntu8.4 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 1

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  I just tried to update

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64-signed 1.93.5+2.02-2ubuntu8.4
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: kpatch_livepatch_Ubuntu_4_15_0_23_25_generic_42
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Wed Sep  5 21:01:50 2018
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2016-05-05 (853 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3ubuntu1
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu2
   apt  1.6.3ubuntu0.1
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.93.5+2.02-2ubuntu8.4 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to bionic on 2018-05-03 (125 days ago)

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