[Bug 1813389] Re: package grub-efi-amd64-signed (not installed) failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Apport retracing service]

*** This bug is a duplicate of bug 1800106 ***
    https://bugs.launchpad.net/bugs/1800106

Thank you for taking the time to report this crash and helping to make
this software better.  This particular crash has already been reported
and is a duplicate of bug #1800106, so is being marked as such.  Please
look at the other bug report to see if there is any missing information
that you can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report.  Please continue to report any other bugs you may
find.

** Tags removed: need-duplicate-check

** This bug has been marked a duplicate of bug 1800106
   package grub-efi-amd64-signed (not installed) failed to install/upgrade: 'cannot find EFI directory'

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https://bugs.launchpad.net/bugs/1813389

Title:
  package grub-efi-amd64-signed (not installed) 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:
  New

Bug description:
  initially grub2 failed to install but after repairing the boot it is
  working. But there is no error in my device's boot sector.

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64-signed (not installed)
  ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  AptOrdering: NULL: ConfigurePending
  Architecture: amd64
  Date: Sat Jan 26 13:53:38 2019
  Df:
   Filesystem     1K-blocks    Used Available Use% Mounted on
   /dev/sda6       97904924 4257708  88630896   5% /
   udev             4002024       0   4002024   0% /dev
   tmpfs             804640    1892    802748   1% /run
  DpkgTerminalLog:
   Setting up grub-efi-amd64-signed (1.93.3+2.02-2ubuntu8.2) ...
   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
  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  1.6.3
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed (not installed) 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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