package isc-dhcp-server 4.3.5-3ubuntu7 failed to install/upgrade: installed isc-dhcp-server package post-installation script subprocess returned error exit status 1

[Jason Bourne]

I don't know anything about the issue.#
Operating system said there is an issue and do you want to report it.
I said yes :)

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: isc-dhcp-server 4.3.5-3ubuntu7
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
NonfreeKernelModules: lkp_Ubuntu_4_15_0_34_37_generic_44
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
Date: Tue Oct 16 10:42:27 2018
DhServerLeases:

DuplicateSignature:
 package:isc-dhcp-server:4.3.5-3ubuntu7
 Setting up isc-dhcp-server (4.3.5-3ubuntu7) ...
 host: couldn't get address for '{': not found
 dpkg: error processing package isc-dhcp-server (--configure):
  installed isc-dhcp-server package post-installation script subprocess returned error exit status 1
ErrorMessage: installed isc-dhcp-server package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2016-04-10 (919 days ago)
InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
ProcCmdline: BOOT_IMAGE=/vmlinuz-4.15.0-34-generic root=UUID=0dbf526a-b774-4bd5-942b-5848aa763e67 ro quiet splash vt.handoff=1
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
SourcePackage: isc-dhcp
Title: package isc-dhcp-server 4.3.5-3ubuntu7 failed to install/upgrade: installed isc-dhcp-server package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2018-09-22 (23 days ago)