[Bug 1780149] Re: package grub-pc 2.02-2ubuntu8.1 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 2

[Phillip Susi]

You have modified your /etc/default/grub file and left out the ending
quote on this line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux
acpi_backlight=vendor


** Changed in: grub2 (Ubuntu)
       Status: New => Invalid

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

Status in grub2 package in Ubuntu:
  Invalid

Bug description:
  update failed

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: grub-pc 2.02-2ubuntu8.1
  ProcVersionSignature: Ubuntu 4.15.0-21.22-generic 4.15.17
  Uname: Linux 4.15.0-21-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Wed Jul  4 20:54:25 2018
  DuplicateSignature:
   package:grub-pc:2.02-2ubuntu8.1
   Setting up grub-pc (2.02-2ubuntu8.1) ...
   /var/lib/dpkg/info/grub-pc.config: 36: /etc/default/grub: Syntax error: EOF in backquote substitution
   dpkg: error processing package grub-pc (--configure):
    installed grub-pc package post-installation script subprocess returned error exit status 2
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 2
  InstallationDate: Installed on 2016-05-08 (787 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  InvalidGrubScript: /etc/default/grub
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-21-generic root=UUID=d05202f5-c1ac-4323-aba9-0e7bd6543243 ro plymouth:debug drm.debug=0xe
  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  1.6.2
  SourcePackage: grub2
  Title: package grub-pc 2.02-2ubuntu8.1 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 2
  UpgradeStatus: No upgrade log present (probably fresh install)

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