package isc-dhcp-client 4.2.4-7ubuntu12.6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 29

[Pavel Krusina]

it is broken.
crashes all the time.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: isc-dhcp-client 4.2.4-7ubuntu12.6
ProcVersionSignature: Ubuntu 4.4.0-36.55~14.04.1-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
Date: Mon Sep 26 14:04:32 2016
DhclientLeases:

DuplicateSignature: package:isc-dhcp-client:4.2.4-7ubuntu12.6:subprocess installed post-installation script returned error exit status 29
ErrorMessage: subprocess installed post-installation script returned error exit status 29
InstallationDate: Installed on 2016-01-22 (248 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic.efi.signed root=UUID=bf08c049-914c-4ec5-b278-5813ac8667a7 ro quiet splash vt.handoff=7
SourcePackage: isc-dhcp
Title: package isc-dhcp-client 4.2.4-7ubuntu12.6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 29
UpgradeStatus: No upgrade log present (probably fresh install)