package python-libxml2 2.9.3+dfsg1-1ubuntu0.4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[frank shi]

when I update my system, it fail down and there are some errors.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: python-libxml2 2.9.3+dfsg1-1ubuntu0.4
ProcVersionSignature: Ubuntu 4.4.0-101.124-generic 4.4.95
Uname: Linux 4.4.0-101-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.14
Architecture: amd64
Date: Mon Dec 11 09:14:23 2017
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-05-21 (203 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.3
 apt 1.2.24
SourcePackage: libxml2
Title: package python-libxml2 2.9.3+dfsg1-1ubuntu0.4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)