package isc-dhcp-server 4.2.4-7ubuntu12.3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Angelo]

I don't know

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: isc-dhcp-server 4.2.4-7ubuntu12.3
ProcVersionSignature: Ubuntu 3.13.0-57.95-generic 3.13.11-ckt21
Uname: Linux 3.13.0-57-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
Date: Thu Jul 9 09:11:29 2015
DhServerLeases:

DuplicateSignature: package:isc-dhcp-server:4.2.4-7ubuntu12.3:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2014-12-03 (217 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-3.13.0-57-generic.efi.signed root=UUID=d126cfdb-524c-490d-8fcf-9babd50df6c7 ro quiet splash vt.handoff=7
SourcePackage: isc-dhcp
Title: package isc-dhcp-server 4.2.4-7ubuntu12.3 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: 2015-06-03T14:29:24.910872

[Launchpad Janitor (janitor)]

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