package python-idna 2.6-1 failed to install/upgrade: installed python-idna package post-installation script subprocess returned error exit status 1

[Nikhil Shrivastava]

not able to update python to 3.6 version

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: python-idna 2.6-1
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Thu May 31 05:34:48 2018
Dependencies:

ErrorMessage: installed python-idna package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-05-30 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: python-idna
Title: package python-idna 2.6-1 failed to install/upgrade: installed python-idna package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.