package install-info 6.1.0.dfsg.1-5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

[Sudheesh]

The installation or removal of a software package failed.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: install-info 6.1.0.dfsg.1-5
ProcVersionSignature: Ubuntu 4.4.0-87.110-generic 4.4.73
Uname: Linux 4.4.0-87-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Wed Aug 8 15:01:28 2018
DuplicateSignature:
 package:install-info:6.1.0.dfsg.1-5
 Setting up install-info (6.1.0.dfsg.1-5) ...
 /usr/sbin/update-info-dir: 6: export: {http,https,ftp}_proxy: bad variable name
 dpkg: error processing package install-info (--configure):
  subprocess installed post-installation script returned error exit status 2
ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationDate: Installed on 2016-10-20 (656 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.4
 apt 1.2.20
SourcePackage: texinfo
Title: package install-info 6.1.0.dfsg.1-5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)

[Sudheesh (sudheesh)]

The installation or removal of a software package failed.