[Bug 1781659] Re: package grub-efi-amd64-signed 1.93.2+2.02-2ubuntu8.1 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess 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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Title:
  package grub-efi-amd64-signed 1.93.2+2.02-2ubuntu8.1 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 1

Status in grub2-signed package in Ubuntu:
  Confirmed

Bug description:
  Setting up grub-efi-amd64 (2.02-2ubuntu8.1) ...
  Installing for x86_64-efi platform.
  grub-install: error: cannot find EFI directory.
  Failed: grub-install --target=x86_64-efi  
  WARNING: Bootloader is not properly installed, system may not be bootable

  Setting up grub-efi-amd64-signed (1.93.2+2.02-2ubuntu8.1) ...
  Installing for x86_64-efi platform.
  grub-install: error: cannot find EFI directory.
  dpkg: error processing package grub-efi-amd64-signed (--configure):
   installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

  Setting up libbind9-160:amd64 (1:9.11.3+dfsg-1ubuntu1.1) ...
  dpkg: dependency problems prevent configuration of shim-signed:
   shim-signed depends on grub-efi-amd64-signed; however:
    Package grub-efi-amd64-signed is not configured yet.

  Errors were encountered while processing:
   grub-efi-amd64-signed
   shim-signed
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64-signed 1.93.2+2.02-2ubuntu8.1
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Sat Jul 14 03:37:26 2018
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  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  1.6.2
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.93.2+2.02-2ubuntu8.1 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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