package grub-pc 2.02~beta2-9ubuntu1.7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 127

[MANDEEP SINGH]

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ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: grub-pc 2.02~beta2-9ubuntu1.7
ProcVersionSignature: Ubuntu 3.13.0-74.118-generic 3.13.11-ckt30
Uname: Linux 3.13.0-74-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
Date: Wed Jan 6 00:53:31 2016
DuplicateSignature: package:grub-pc:2.02~beta2-9ubuntu1.7:subprocess installed post-installation script returned error exit status 127
ErrorMessage: subprocess installed post-installation script returned error exit status 127
InstallationDate: Installed on 2015-12-08 (28 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
InvalidGrubScript: /etc/default/grub
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-74-generic root=UUID=ed111cee-a456-4d2b-81b4-9c8f3494d4f7 ro acpi_osi=Linux drm.debug=0xe plymouth:debug
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.5
 apt 1.0.1ubuntu2.10
SourcePackage: grub2
Title: package grub-pc 2.02~beta2-9ubuntu1.7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 127
UpgradeStatus: No upgrade log present (probably fresh install)

[Phillip Susi (psusi)]

You have removed the ending backtick from /etc/default/grub on the line:

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian

You need to put it back.