[Bug 1702335] Re: package grub-efi-amd64-signed (not installed) failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: grub2-signed (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1702335

Title:
  package grub-efi-amd64-signed (not installed) failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  in order to fix this problem i did:

  apt-get purge grub\*
  apt-get install grub-efi
  apt-get autoremove
  update-grub

  and before that in order to boot the system i had to manually install grub from a live-usb:
  mount /dev/sda2 /mnt
  grub-install /dev/sda --root-directory=/mnt

  the installed seems to mess up if your computer does efi boot but not
  secure boot.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: grub-efi-amd64-signed (not installed)
  ProcVersionSignature: Ubuntu 4.8.0-58.63~16.04.1-generic 4.8.17
  Uname: Linux 4.8.0-58-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.6
  Architecture: amd64
  Date: Tue Jul  4 19:11:29 2017
  DuplicateSignature:
   package:grub-efi-amd64-signed:(not installed)
   Setting up grub-efi-amd64-signed (1.66.11+2.02~beta2-36ubuntu3.11) ...
   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
  InstallationDate: Installed on 2017-07-04 (0 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.2
   apt  1.2.20
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed (not installed) 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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