package install-info 6.7.0.dfsg.2-5 failed to install/upgrade: installed install-info package post-installation script subprocess returned error exit status 2

Not able to install it.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: install-info 6.7.0.dfsg.2-5
ProcVersionSignature: Ubuntu 5.8.0-53.60~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-53-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
Date: Fri Jun 11 15:19:15 2021
DpkgTerminalLog:
 Setting up install-info (6.7.0.dfsg.2-5) ...
 /usr/sbin/update-info-dir: 2: export: : bad variable name
 dpkg: error processing package install-info (--configure):
  installed install-info package post-installation script subprocess returned error exit status 2
DuplicateSignature:
 package:install-info:6.7.0.dfsg.2-5
 Setting up install-info (6.7.0.dfsg.2-5) ...
 /usr/sbin/update-info-dir: 2: export: : bad variable name
 dpkg: error processing package install-info (--configure):
  installed install-info package post-installation script subprocess returned error exit status 2
ErrorMessage: installed install-info package post-installation script subprocess returned error exit status 2
InstallationDate: Installed on 2021-05-07 (35 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.5
SourcePackage: texinfo
Title: package install-info 6.7.0.dfsg.2-5 failed to install/upgrade: installed install-info package post-installation script subprocess returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)