[Bug 1809050] Re: package grub-pc 2.02-2ubuntu8.9 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

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** Tags removed: need-duplicate-check

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Title:
  package grub-pc 2.02-2ubuntu8.9 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:
  Original =installation not clean, under emergency activation with
  external disks.

  Possible initiation of difficulties 6 month ago when passing from
  ubuntu 14.04 to 16.04 (either overflow of partition, or bad transition
  from graphic server  (mixed things between Lubuntu; Xubuntu and
  Ubuntu.

  Initial emergency solution from september , maybe with a 32bits
  systeme on secondary hard-drive, but activation of previous /home
  directory (probably 64bits).

  Manual adjustment of grub.cfg in ordre to get access to xubuntu18.04
  (from external amovible backup disk.

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-pc 2.02-2ubuntu8.9
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  Date: Tue Dec 18 23:28:35 2018
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2018-12-18 (0 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  InvalidGrubScript: /etc/grub.d/39_custom (copie) /etc/grub.d/40_custom
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic root=UUID=0beca069-d781-439a-8538-c4fc07172aaa ro quiet splash
  Python3Details: /usr/bin/python3.6, Python 3.6.7, python3-minimal, 3.6.7-1~18.04
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu2.1
   apt  1.6.6
  SourcePackage: grub2
  Title: package grub-pc 2.02-2ubuntu8.9 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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