package python3-lxml:amd64 4.2.1-1ubuntu0.1 failed to install/upgrade: installed python3-lxml:amd64 package post-installation script subprocess returned error exit status 3

[Lovesh]

gave this error while updating

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: python3-lxml:amd64 4.2.1-1ubuntu0.1
ProcVersionSignature: Ubuntu 4.15.0-42.45-generic 4.15.18
Uname: Linux 4.15.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Tue Dec 11 18:08:49 2018
DuplicateSignature:
 package:python3-lxml:amd64:4.2.1-1ubuntu0.1
 Setting up python3-lxml:amd64 (4.2.1-1ubuntu0.1) ...
 E: py3compile:243: Requested versions are not installed
 dpkg: error processing package python3-lxml:amd64 (--configure):
  installed python3-lxml:amd64 package post-installation script subprocess returned error exit status 3
ErrorMessage: installed python3-lxml:amd64 package post-installation script subprocess returned error exit status 3
InstallationDate: Installed on 2018-01-05 (339 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
Python3Details: /usr/bin/python3.6m, Python 3.6.7, python3-minimal, 3.6.7-1~18.04
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.1
 apt 1.6.6
SourcePackage: lxml
Title: package python3-lxml:amd64 4.2.1-1ubuntu0.1 failed to install/upgrade: installed python3-lxml:amd64 package post-installation script subprocess returned error exit status 3
UpgradeStatus: Upgraded to bionic on 2018-09-27 (75 days ago)