[Bug 1751850] Re: package grub-efi-amd64-signed 1.66.17+2.02~beta2-36ubuntu3.17 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[林博仁]

This is due to the installation script doesn't consider that PC variant
of grub *may* co-exist.  Here's a patch that forces it to install Signed
EFI variant of GRUB bootloader instead.

** Patch added: "ubuntu-bug-1751850.patch"
   https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1751850/+attachment/5135674/+files/ubuntu-bug-1751850.patch

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Title:
  package grub-efi-amd64-signed 1.66.17+2.02~beta2-36ubuntu3.17 failed
  to install/upgrade: subprocess installed post-installation script
  returned error exit status 1

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  On startup the system reports this bug... no idea

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: grub-efi-amd64-signed 1.66.17+2.02~beta2-36ubuntu3.17
  ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13
  Uname: Linux 4.13.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  Date: Sun Feb 25 11:56:37 2018
  DuplicateSignature:
   package:grub-efi-amd64-signed:1.66.17+2.02~beta2-36ubuntu3.17
   Setting up grub-efi-amd64-signed (1.66.17+2.02~beta2-36ubuntu3.17) ...
   grub-install: error: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory.
   dpkg: error processing package grub-efi-amd64-signed (--configure):
    subprocess installed post-installation script returned error exit status 1
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.3
   apt  1.2.25
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.66.17+2.02~beta2-36ubuntu3.17 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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