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

[Sandi Vujaković]

Jim, I only know the GUI way of doing it. I select all of the kernels
above 4.15.xx and select remove, but only once I have booted up with the
older kernel (once the GRUB menu appears, go into Advanced options and
look for 4.15 and boot off of that, just don't select "(recovery
mode)"), type "apt autoremove", but since you probably don't use the
terminal logged in as root in it, type in "sudo apt autoremove" and it
should automatically start configuring the packages that were not
configured previously, a.k.a. the GRUB updates, open UKUU, install the
latest available kernel, restart and enjoy!

Do note that I am using an HP laptop and that a previous GRUB update (a
few months ago) enrolled new Secure Boot keys, which might affect the
fact that I'm booting with unsigned kernels and Secure Boot on.

Good luck and have a nice day!

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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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