[Bug 1777278] Re: package grub-pc 2.02-2ubuntu8 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 20

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** Tags removed: need-duplicate-check

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Title:
  package grub-pc 2.02-2ubuntu8 failed to install/upgrade: installed
  grub-pc package post-installation script subprocess returned error
  exit status 20

Status in grub2 package in Ubuntu:
  New

Bug description:
  Upgrading from 17.10 to 18.04. Grub failed to update

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-pc 2.02-2ubuntu8
  ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
  Uname: Linux 4.15.0-24-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Sat Jun 16 20:49:36 2018
  DuplicateSignature:
   package:grub-pc:2.02-2ubuntu8
   Setting up grub-pc (2.02-2ubuntu8) ...
   dpkg: error processing package grub-pc (--configure):
    installed grub-pc package post-installation script subprocess returned error exit status 20
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 20
  InstallationDate: Installed on 2017-04-15 (427 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-24-generic root=UUID=f56e8ba1-a497-468b-b2ac-22a8ca881a5a ro intel_iommu=on iommn=pt rd.driver.pre=vfio-pci
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu2
   apt  1.6.1
  SourcePackage: grub2
  Title: package grub-pc 2.02-2ubuntu8 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 20
  UpgradeStatus: Upgraded to bionic on 2018-06-16 (0 days ago)

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