package libcapnp-0.5.3:amd64 0.5.3-2ubuntu1 failed to install/upgrade: package libcapnp-0.5.3:amd64 is already installed and configured

I don't know

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libcapnp-0.5.3:amd64 0.5.3-2ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-91.114-generic 4.4.76
Uname: Linux 4.4.0-91-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.10
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
Date: Sat Aug 12 07:13:01 2017
Dependencies:
 gcc-5-base 5.4.0-6ubuntu1~16.04.4
 gcc-6-base 6.0.1-0ubuntu1
 libc6 2.23-0ubuntu9
 libgcc1 1:6.0.1-0ubuntu1
 libstdc++6 5.4.0-6ubuntu1~16.04.4
DuplicateSignature:
 package:libcapnp-0.5.3:amd64:0.5.3-2ubuntu1
 Processing triggers for man-db (2.7.5-1) ...
 dpkg: error processing package libcapnp-0.5.3:amd64 (--configure):
  package libcapnp-0.5.3:amd64 is already installed and configured
ErrorMessage: package libcapnp-0.5.3:amd64 is already installed and configured
InstallationDate: Installed on 2017-07-02 (44 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.24
SourcePackage: dpkg
Title: package libcapnp-0.5.3:amd64 0.5.3-2ubuntu1 failed to install/upgrade: package libcapnp-0.5.3:amd64 is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)