package libc6:amd64 2.23-0ubuntu9 failed to install/upgrade: package libc6:amd64 is already installed and configured

[katon134]

machine tries to update automatically and fails. Lately, it wont let me update manually, dpkg is locked.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libc6:amd64 2.23-0ubuntu9
ProcVersionSignature: Ubuntu 4.4.0-79.100-generic 4.4.67
Uname: Linux 4.4.0-79-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.6
AptdaemonVersion: 1.1.1+bzr982-0ubuntu14
Architecture: amd64
CrashReports: 600:0:116:110684:2017-06-23 02:55:44.458727121 -0700:2017-06-23 02:55:45.458727121 -0700:/var/crash/libc6:amd64.0.crash
Date: Fri Jun 23 02:55:45 2017
Dependencies:
 gcc-6-base 6.0.1-0ubuntu1
 libc6 2.23-0ubuntu9
 libgcc1 1:6.0.1-0ubuntu1
DpkgTerminalLog:
 dpkg: error processing package libc6:amd64 (--configure):
  package libc6:amd64 is already installed and configured
ErrorMessage: package libc6:amd64 is already installed and configured
InstallationDate: Installed on 2017-03-12 (104 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: dpkg
Title: package libc6:amd64 2.23-0ubuntu9 failed to install/upgrade: package libc6:amd64 is already installed and configured
UpgradeStatus: No upgrade log present (probably fresh install)