[Bug 1868228] Re: package grub-efi-amd64-signed 1.128.2+2.04-1ubuntu12.2 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

[Siawash Osian]

hello Steve,

basically i have a lenovo B575 laptop which had wind7 OS on it. and
later I decided to upgrade to ubuntu for my studying purposes. so I did
that and tried installing ubuntu 19.10 through USB drive ubuntu image on
it. during installation i choose to let ubuntu decide about my
partitions by deleting everything in my laptop and install a fresh new
os UBUNTU 19.10. but unfortunately installation failed during installing
the GRUB package and system asked me to restart. then i restarted it.
which led me to GRUB black screen. after that i tried googling a lot and
used boot-repair several time. and finally i restarted my PC and i see
ubuntu OS came up and i logged into it by entering my password. but in
start-up I received those error that mentioned in this bug-ticket:

[ package grub-efi-amd64-signed 1.128.2+2.04-1ubuntu12.2 failed to
install/upgrade: installed grub-efi-amd64-signed package post-
installation script subprocess returned error exit status 1 ]

please help me out what to do; as i'm very new to ubuntu.

thank you!

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https://bugs.launchpad.net/bugs/1868228

Title:
  package grub-efi-amd64-signed 1.128.2+2.04-1ubuntu12.2 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:
  Don't know... the system just said,  by a banner, there's a bug. sSo,
  I report it, but didn't remark anything.

  ProblemType: Package
  DistroRelease: Ubuntu 19.10
  Package: grub-efi-amd64-signed 1.128.2+2.04-1ubuntu12.2
  ProcVersionSignature: Ubuntu 5.3.0-42.34-generic 5.3.18
  Uname: Linux 5.3.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.6
  Architecture: amd64
  Date: Fri Mar 20 09:40:49 2020
  ErrorMessage: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
  Python3Details: /usr/bin/python3.7, Python 3.7.5, python3-minimal, 3.7.5-1
  PythonDetails: /usr/bin/python2.7, Python 2.7.17, python-minimal, 2.7.17-1
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu2
   apt  1.9.4
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.128.2+2.04-1ubuntu12.2 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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