package libpam-modules:amd64 1.1.8-1ubuntu2.2 failed to install/upgrade: package libpam-modules:amd64 is already installed and configured

i dont know

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libpam-modules:amd64 1.1.8-1ubuntu2.2
ProcVersionSignature: Ubuntu 3.13.0-116.163-generic 3.13.11-ckt39
Uname: Linux 3.13.0-116-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.23
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
CrashReports:
 600:0:116:497875:2017-04-10 19:15:37.550169229 +0800:2017-04-10 19:15:38.550169229 +0800:/var/crash/libpam-modules:amd64.0.crash
 600:0:116:497087:2017-04-10 19:15:36.766169309 +0800:2017-04-10 19:15:37.766169309 +0800:/var/crash/libpam-modules-bin.0.crash
 600:0:116:497167:2017-04-10 19:15:38.370169265 +0800:2017-04-10 19:15:38.346169266 +0800:/var/crash/libpam-modules.0.crash
Date: Mon Apr 10 19:15:38 2017
DuplicateSignature: package:libpam-modules:amd64:1.1.8-1ubuntu2.2:package libpam-modules:amd64 is already installed and configured
ErrorMessage: package libpam-modules:amd64 is already installed and configured
InstallationDate: Installed on 2017-04-07 (2 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.19
SourcePackage: dpkg
Title: package libpam-modules:amd64 1.1.8-1ubuntu2.2 failed to install/upgrade: package libpam-modules:amd64 is already installed and configured
UpgradeStatus: Upgraded to xenial on 2017-04-10 (0 days ago)