package isc-dhcp-server 4.2.4-7ubuntu12.5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Dmitry Vakhnin]

When i want to upgrade packets.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: isc-dhcp-server 4.2.4-7ubuntu12.5
ProcVersionSignature: Ubuntu 4.2.0-35.40~14.04.1-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.20
Architecture: i386
Date: Sun Apr 24 13:53:50 2016
DhServerLeases:

DuplicateSignature: package:isc-dhcp-server:4.2.4-7ubuntu12.5:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2016-04-09 (14 days ago)
InstallationMedia: Xubuntu 14.04.4 LTS "Trusty Tahr" - Release i386 (20160217.1)
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.2.0-35-generic root=UUID=66ba3f9b-4ca7-4214-818d-17c2edb5c650 ro quiet splash
SourcePackage: isc-dhcp
Title: package isc-dhcp-server 4.2.4-7ubuntu12.5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.dhcp.dhcpd.conf: 2016-04-14T22:27:40.314241

[Brian Murray (brian-murray)]

From dmesg we can see the following:

[ 3545.877107] init: isc-dhcp-server pre-start process (20195) terminated with status 1