[Bug 1788727] Re: upgrade crashing due to unsigned kernels

[Leonardo Müller]

The package shim-signed started to fail like this one in the latest
days. I have installed in my computer the following unsigned kernels:

drm-tip (4.19-rc4 with multiple patches);
4.18.6 (Ubuntu mainline)
4.18-rc1 (Ubuntu mainline)
4.17.19 (Ubuntu mainline)
4.17.18 (Ubuntu mainline)
4.17.18 (not a typo, it's another build)

I understand very well why I have this problem, but I have two questions
related to this bug:

1) I could install mainline kernels before without this error and the
system booted normally with Secure Boot enabled. Is the Secure Boot
implementation of my notebook failing?

2) Would it be possible to sign new builds of the mainline kernels at
kernel.ubuntu.com/~kernel-ppa/mainline/ ?

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https://bugs.launchpad.net/bugs/1788727

Title:
  upgrade crashing due to unsigned kernels

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  not surre  happened during upgrade to bionic beaver

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64 2.02-2ubuntu8.3
  Uname: Linux 4.7.0-040700-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Thu Aug 23 19:33:07 2018
  ErrorMessage: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2018-05-30 (85 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.7.0-040700-generic root=UUID=d9d727a6-5798-4fe1-8ac0-fb79b1d05431 ro quiet splash vt.handoff=7
  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 2018-08-23 (0 days ago)

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