[Bug 1975388] Re: upgrade from 18.04 to 20.04 while on rollbacked kernel 4.15-0-177 - package grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Julian Andres Klode]

You didn't remove all the 177 packages, the headers package or so pulls
in a kernel and then apt switches to the unsigned one.

I'm going to reassign this to Linux, as we should ensure that doesn't
happen by not allowing unsigned to satisfy those dependencies.

** Package changed: grub2-signed (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
       Status: Invalid => New

** Summary changed:

- upgrade from 18.04 to 20.04 while on rollbacked kernel 4.15-0-177 - package grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
+ Removing signed kernel installs unsigned one due to dependencies

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Title:
  Removing signed kernel installs unsigned one due to dependencies

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Dell XPS 15 9570. Dual boot with Windows 10. Linux was on 18.04 when
  attempting to upgrade to 20.04. Had previously installed kernel
  4.15-0-177 which was rolled back to working kernel 4.15-0-175 due to
  issues already reported in Bug #1973482. Due to rollback, there was an
  unsigned image of kernel 4.15-0-177 in the machine, which caused the
  upgrade 20.04 to fail with following error. Ubuntu upgrade attempted
  while logged into kernel 4.15-0-175.

  package grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 1

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2
  ProcVersionSignature: Ubuntu 5.4.0-110.124-generic 5.4.181
  Uname: Linux 5.4.0-110-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.24
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Sat May 21 12:24:34 2022
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2018-09-23 (1336 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.8
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to focal on 2022-05-21 (0 days ago)

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