package libftgl2:amd64 2.1.3~rc5-4+nmu1 failed to install/upgrade: package libftgl2:amd64 is already installed and configured

[massaky]

i don't know what is this problem

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libftgl2:amd64 2.1.3~rc5-4+nmu1
ProcVersionSignature: Ubuntu 4.4.0-43.63-generic 4.4.21
Uname: Linux 4.4.0-43-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.1
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
Date: Wed Oct 26 22:52:29 2016
DuplicateSignature:
 package:libftgl2:amd64:2.1.3~rc5-4+nmu1
 Processing triggers for doc-base (0.10.7) ...
 Processing 1 changed doc-base file...
 dpkg: error processing package libftgl2:amd64 (--configure):
  package libftgl2:amd64 is already installed and configured
ErrorMessage: package libftgl2:amd64 is already installed and configured
InstallationDate: Installed on 2016-10-16 (10 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: dpkg
Title: package libftgl2:amd64 2.1.3~rc5-4+nmu1 failed to install/upgrade: package libftgl2:amd64 is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)