package upstart 1.13.2-0ubuntu21.1 failed to install/upgrade: package upstart is not ready for configuration cannot configure (current status 'half-installed')

Error while installing upstart

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: upstart 1.13.2-0ubuntu21.1
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
AptOrdering:
 upstart: Configure
 NULL: ConfigurePending
Architecture: amd64
Date: Tue Jun 7 11:30:21 2016
DpkgTerminalLog:
 dpkg: error processing package upstart (--configure):
  package upstart is not ready for configuration
  cannot configure (current status 'half-installed')
ErrorMessage: package upstart is not ready for configuration cannot configure (current status 'half-installed')
InstallationDate: Installed on 2016-05-20 (18 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: upstart
Title: package upstart 1.13.2-0ubuntu21.1 failed to install/upgrade: package upstart is not ready for configuration cannot configure (current status 'half-installed')
UpgradeStatus: No upgrade log present (probably fresh install)
UpstartBugCategory: Session
UpstartRunningSessionCount: 2
UpstartRunningSystemVersion: Error: command ['initctl', '--system', 'version'] failed with exit code 1: initctl: Name "com.ubuntu.Upstart" does not exist