package sharutils 1:4.15.2-1 failed to install/upgrade: package sharutils is already installed and configured

message came up automatically on startup. cause not clear

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: sharutils 1:4.15.2-1
ProcVersionSignature: Ubuntu 4.4.0-85.108-generic 4.4.73
Uname: Linux 4.4.0-85-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.1-0ubuntu2.9
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
CrashReports: 600:0:115:169165:2017-07-12 18:48:40.600028991 +0300:2017-07-12 18:48:41.600028991 +0300:/var/crash/sharutils.0.crash
Date: Wed Jul 12 18:48:40 2017
Dependencies:
 gcc-6-base 6.0.1-0ubuntu1
 libc6 2.23-0ubuntu9
 libgcc1 1:6.0.1-0ubuntu1
DuplicateSignature:
 package:sharutils:1:4.15.2-1
 Processing triggers for libc-bin (2.23-0ubuntu9) ...
 dpkg: error processing package sharutils (--configure):
  package sharutils is already installed and configured
ErrorMessage: package sharutils is already installed and configured
InstallationDate: Installed on 2016-02-11 (517 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: dpkg
Title: package sharutils 1:4.15.2-1 failed to install/upgrade: package sharutils is already installed and configured
UpgradeStatus: Upgraded to xenial on 2017-07-07 (5 days ago)