[Bug 1799577] Re: package grub-pc 2.02-2ubuntu8.6 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

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Title:
  package grub-pc 2.02-2ubuntu8.6 failed to install/upgrade: installed
  grub-pc package post-installation script subprocess returned error
  exit status 1

Status in grub2 package in Ubuntu:
  New

Bug description:
  I have a Lubuntu installation, in which I cannot upgrade because
  grub2-pc refuses to install. After a while I found that linux-
  image-4.15.0.38-generic also not installs, but grub2 in the main one,
  because every apt installation is extremely long, since it tries to
  install grub2, but it cannot.

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-pc 2.02-2ubuntu8.6
  ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
  Uname: Linux 4.15.0-36-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
  Date: Tue Oct 23 17:46:39 2018
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2018-09-20 (33 days ago)
  InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-36-generic root=UUID=3a1dadee-21a1-41ca-a739-bc432c4a9312 ro quiet splash vt.handoff=1
  Python3Details: /usr/bin/python3.6, Python 3.6.6, 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  1.6.3ubuntu0.1
  SourcePackage: grub2
  Title: package grub-pc 2.02-2ubuntu8.6 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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