package libexpat1:amd64 2.1.0-4ubuntu1.2 failed to install/upgrade: package libexpat1:amd64 is already installed and configured

[nev]

problem noticed when sudo apt-get upgrade (following error free sudo apt-get updat) from within terminal.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: libexpat1:amd64 2.1.0-4ubuntu1.2
ProcVersionSignature: Ubuntu 4.2.0-35.40~14.04.1-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.20
AptdaemonVersion: 1.1.1-1ubuntu5.2
Architecture: amd64
Date: Sat May 21 12:00:12 2016
Dependencies:
 gcc-4.9-base 4.9.3-0ubuntu4
 libc6 2.19-0ubuntu6.7
 libgcc1 1:4.9.3-0ubuntu4
 multiarch-support 2.19-0ubuntu6.7
DuplicateSignature: package:libexpat1:amd64:2.1.0-4ubuntu1.2:package libexpat1:amd64 is already installed and configured
ErrorMessage: package libexpat1:amd64 is already installed and configured
InstallationDate: Installed on 2016-04-10 (40 days ago)
InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.6
 apt 1.0.1ubuntu2.13
SourcePackage: dpkg
Title: package libexpat1:amd64 2.1.0-4ubuntu1.2 failed to install/upgrade: package libexpat1:amd64 is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)