bug after install software with a terminal

[gregory]

I wanted to install a little woftware to convert files and this bug appears. Now there is a bug message when ubunbu starts, when the desktop starts.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libavcodec-ffmpeg-extra56:amd64 7:2.8.10-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
Date: Tue Jan 31 21:17:06 2017
DuplicateSignature:
 package:libavcodec-ffmpeg-extra56:amd64:7:2.8.10-0ubuntu0.16.04.1
 Processing triggers for mime-support (3.59ubuntu1) ...
 dpkg: error processing package libmspack0:amd64 (--configure):
  package libmspack0:amd64 is already installed and configured
ErrorMessage: package libavcodec-ffmpeg-extra56:amd64 is already installed and configured
InstallationDate: Installed on 2016-04-26 (282 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.19
SourcePackage: dpkg
Title: package libavcodec-ffmpeg-extra56:amd64 7:2.8.10-0ubuntu0.16.04.1 failed to install/upgrade: package libavcodec-ffmpeg-extra56:amd64 is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.