[Bug 1788864] 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

[josh]

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:                              │ 
 │                                                                           │ 
 │  4.18.0-041800rc1-generic                                                 │ 
 │                                                                           │ 
 │                                                                           │ 
 │ 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.

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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:
  New

Bug description:
  When installing from apt-get 4.18.0-041800rc1-generic, the UEFI
  Secureboot on yoga930 or 920  claims that the kernel is unsigned and
  can't install it.

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64 2.02-2ubuntu8.3
  Uname: Linux 4.18.0-041800rc1-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Fri Aug 24 09:13:54 2018
  ErrorMessage: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2018-06-16 (68 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-041800rc1-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=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: No upgrade log present (probably fresh install)

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