[Bug 1784218] Re: package grub-efi-amd64 2.02-2ubuntu8.2 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 128

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** Tags removed: need-duplicate-check

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Title:
  package grub-efi-amd64 2.02-2ubuntu8.2 failed to install/upgrade:
  installed grub-efi-amd64 package post-installation script subprocess
  returned error exit status 128

Status in grub2 package in Ubuntu:
  New

Bug description:
  I was booting into Ubuntu, using the default option in grub, and was
  able to enter my password in the login screen, but the displays
  started flickering a lot, and there were a lot of repeated text
  messages (it switched into text mode).  I finally did a hard reset and
  tried booting into ubuntu - generic which seemed to work.  There was a
  prompt from apt to update, so I did, and then I got this error
  message.

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-efi-amd64 2.02-2ubuntu8.2
  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
  Architecture: amd64
  Date: Sun Jul 29 06:00:14 2018
  ErrorMessage: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 128
  InstallationDate: Installed on 2017-11-11 (259 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-29-generic root=UUID=a68c1ee5-ce8a-4eed-b95f-7625f3118746 ro quiet splash vt.handoff=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
  Title: package grub-efi-amd64 2.02-2ubuntu8.2 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 128
  UpgradeStatus: Upgraded to bionic on 2018-06-23 (35 days ago)

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