[Bug 1774712] Re: package grub-pc 2.02~beta2-36ubuntu3.18 failed to install/upgrade: subprocess installed post-installation script returned error exit status 127

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** Tags removed: need-duplicate-check

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Title:
  package grub-pc 2.02~beta2-36ubuntu3.18 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 127

Status in grub2 package in Ubuntu:
  New

Bug description:
  While iḿ instaling the updates , it comes this erro

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: grub-pc 2.02~beta2-36ubuntu3.18
  ProcVersionSignature: Ubuntu 4.4.0-91.114-generic 4.4.76
  Uname: Linux 4.4.0-91-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  Date: Fri Jun  1 20:44:35 2018
  DuplicateSignature:
   package:grub-pc:2.02~beta2-36ubuntu3.18
   Setting up grub-pc (2.02~beta2-36ubuntu3.18) ...
   /var/lib/dpkg/info/grub-pc.config: 41: /etc/default/grub: GRUB-BACKGROUND=/home/azm/Pictures/Wallpapers/sharingan-wallpaper-2.png: not found
   dpkg: error processing package grub-pc (--configure):
    subprocess installed post-installation script returned error exit status 127
  ErrorMessage: subprocess installed post-installation script returned error exit status 127
  InstallationDate: Installed on 2017-05-03 (394 days ago)
  InstallationMedia: It
  InvalidGrubScript: /etc/default/grub
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-91-generic root=UUID=316dc53b-db45-474d-ae3f-4e3a998b3854 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.4
   apt  1.2.26
  SourcePackage: grub2
  Title: package grub-pc 2.02~beta2-36ubuntu3.18 failed to install/upgrade: subprocess installed post-installation script returned error exit status 127
  UpgradeStatus: No upgrade log present (probably fresh install)

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