[Bug 1788630] Re: package grub-efi-amd64 2.02-2ubuntu8.3 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1

[Phillip Susi]

*** This bug is a duplicate of bug 1788727 ***
    https://bugs.launchpad.net/bugs/1788727

** This bug has been marked a duplicate of bug 1788727
   upgrade crashing due to unsigned kernels

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Title:
  package grub-efi-amd64 2.02-2ubuntu8.3 failed to install/upgrade:
  installed grub-efi-amd64 package post-installation script subprocess
  returned error exit status 1

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  On the update of grub-efi-amd64, it's now warning about unsigned
  kernels, which it was not doing before, and failing. However, before
  this update, the unsigned kernels were booting properly with Secure
  Boot enabled. I don't know what would make them unbootable now. The
  following message appears on upgrade:

   ┌───────────────────────────┤ unsigned kernels ├────────────────────────────┐
   │                                                                           │ 
   │ Cannot upgrade Secure Boot enforcement policy due to unsigned kernels     │ 
   │                                                                           │ 
   │ Your system has UEFI Secure Boot enabled in firmware, and the following   │ 
   │ kernels present on your system are unsigned:                              │ 
   │                                                                           │ 
   │  4.17.18-041718-lowlatency                                                │ 
   │  4.17.17-041717-lowlatency                                                │ 
   │                                                                           │ 
   │                                                                           │ 
   │ These kernels cannot be verified under Secure Boot.  To ensure your       │ 
   │ system remains bootable, GRUB will not be upgraded on your disk until     │ 
   │ these kernels are removed or replaced with signed kernels.                │ 

  Using the Ubuntu's default kernel is not an option to me, as it has
  bugs that weren't solved and make my notebook fail to boot.

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64 2.02-2ubuntu8.3
  Uname: Linux 4.17.17-041717-lowlatency x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Thu Aug 23 11:30:50 2018
  ErrorMessage: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2017-06-13 (435 days ago)
  InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  InvalidGrubScript: /etc/grub.d/40_custom
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.17.17-041717-lowlatency root=UUID=6b4ae5c0-c78c-49a6-a1ba-029192618a7a ro quiet kvm.ignore_msrs=1 kvm.halt_poll_ns=0 kvm.halt_poll_ns_grow=0 intel_iommu=on iommu=pt i915.enable_gvt=1 resume=UUID=0946602f-3ca2-4379-9012-7a5171928de7 ro mtrr_gran_size=2M mtrr_chunk_size=64M cgroup_enable=memory swapaccount=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
  Title: package grub-efi-amd64 2.02-2ubuntu8.3 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to bionic on 2017-10-20 (307 days ago)

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