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

[Sandi Vujaković]

The workaround that I have is removing all UKUU added/mainline kernels,
finish configuring the grub packages, reinstall the latest mainline
kernel and be on my marry way.

If it installed unsigned versions alongside the signed ones, then the
UKUU kernels removed should have no effect on that. Also, if you can't
boot with unsigned kernels no matter what when Secure Boot is on, then
how come I don't have to turn it off after reinstalling the mainline
kernels and the system boots just fine (and yes, I checked)?

It gives me the impression that Secure Boot only looks at GRUB and
doesn't really see the kernels.

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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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