package python-pkg-resources 20.7.0-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Yasin Yusuf]

i installed the easy_install tool and i got this problem

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: python-pkg-resources 20.7.0-1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
AptOrdering:
 python-pkg-resources: Install
 python-setuptools: Install
 python-pkg-resources: Configure
 python-setuptools: Configure
 NULL: ConfigurePending
Architecture: amd64
Date: Sat May 28 15:54:02 2016
Dependencies:

ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2016-05-28 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt 1.2.10ubuntu1
SourcePackage: python-setuptools
Title: package python-pkg-resources 20.7.0-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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