dhclient does not terminate at computer shutdown

[Karan Jagjitkumar]

The issue occurs on bootup

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: isc-dhcp-client 4.2.4-7ubuntu12.1
ProcVersionSignature: Ubuntu 3.13.0-51.84-generic 3.13.11-ckt18
Uname: Linux 3.13.0-51-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: amd64
Date: Sun May 10 21:56:18 2015
ExecutablePath: /sbin/dhclient
InstallationDate: Installed on 2013-07-04 (676 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
OmitPids: 10628 1948 20212 1345 1031 20334 971 939 874 20370 998 989 1031 20334 971 939 874 20370 998 989
ProcAttrCurrent: /sbin/dhclient (enforce)
ProcCmdline: /sbin/dhclient -d -sf /usr/lib/NetworkManager/nm-dhcp-client.action -pf /run/sendsigs.omit.d/network-manager.dhclient-wlan0.pid -lf /var/lib/NetworkManager/dhclient-028c8955-dc78-4a16-a71a-02a70dd3612b-wlan0.lease -cf /var/lib/NetworkManager/dhclient-wlan0.conf wlan0
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=linux
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
SourcePackage: isc-dhcp
Title: dhclient does not terminate at computer shutdown
UpgradeStatus: Upgraded to trusty on 2014-05-18 (358 days ago)