package apport 2.20.1-0ubuntu2.5 failed to install/upgrade: subprocess new pre-removal script returned error exit status 127

Hi,i m not that mch technical expert in linux system.i try to update and upgrade the package of my ubuntu machine and its showing error.pls check.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: apport 2.20.1-0ubuntu2.5
ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
Uname: Linux 4.8.0-36-generic x86_64
ApportLog:
 ERROR: apport (pid 5509) Thu Aug 31 19:15:40 2017: called for pid 4324, signal 6, core limit 0
 ERROR: apport (pid 5509) Thu Aug 31 19:15:40 2017: executable: /usr/bin/unity-scope-loader (command line "/usr/bin/unity-scope-loader applications/applications.scope applications/scopes.scope commands.scope")
 ERROR: apport (pid 5509) Thu Aug 31 19:15:40 2017: debug: session gdbus call: (true,)

 ERROR: apport (pid 5509) Thu Aug 31 19:15:43 2017: wrote report /var/crash/_usr_bin_unity-scope-loader.1000.crash
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CrashReports:
 640:1000:116:54657:2017-08-31 19:15:44.251554445 +0530:2017-08-31 19:26:44.559352537 +0530:/var/crash/_usr_share_apport_apport-gtk.1000.crash
 640:1000:116:1540867:2017-08-31 19:15:43.011923730 +0530:2017-08-31 19:15:43.555761915 +0530:/var/crash/_usr_bin_unity-scope-loader.1000.crash
 600:0:116:315855:2017-09-01 19:38:18.263080358 +0530:2017-09-01 19:38:19.263080358 +0530:/var/crash/apport.0.crash
Date: Fri Sep 1 19:38:19 2017
ErrorMessage: subprocess new pre-removal script returned error exit status 127
InstallationDate: Installed on 2017-08-31 (1 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.24
SourcePackage: apport
Title: package apport 2.20.1-0ubuntu2.5 failed to install/upgrade: subprocess new pre-removal script returned error exit status 127
UpgradeStatus: No upgrade log present (probably fresh install)