package nsd 4.1.26-1build1 failed to install/upgrade: installed nsd package post-installation script subprocess returned error exit status 1

[Maxime]

Just tried to install nsd package using apt: `sudo apt install nsd` and it has failed.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: nsd 4.1.26-1build1
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Uname: Linux 5.4.0-31-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
AptOrdering:
 libevent-2.1-7:amd64: Install
 libfstrm0:amd64: Install
 libprotobuf-c1:amd64: Install
 nsd:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
CasperMD5CheckResult: skip
Date: Wed May 27 13:17:22 2020
ErrorMessage: installed nsd package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2020-03-23 (65 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200315)
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: nsd
Title: package nsd 4.1.26-1build1 failed to install/upgrade: installed nsd package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Maxime (dp-maxime)]

Apparently, nsd package conflicts with systemd package (systemd-resolve, installed by default) on port 53, but neither package lists other one in Conflicts: section of package control file.

[Maxime (dp-maxime)]

By default, nsd binds to all local interfaces, and systemd-resolved provides stub listener on 127.0.0.53, so another solution would be in adding default configuration for nsd package to bind to 127.0.0.1 interface only.

[Markus Schade (lp-markusschade)]

Without any configuration NSD will automatically start and binds itself to port 53 on all available interfaces/ip addresses. It does not actually conflict with systemd-resolved if both services are configured explicitly. As a universe packages coming directly from Debian, its not tuned to Ubuntu defaults.