package ntp 1:4.2.8p12+dfsg-3ubuntu4.20.04.1 failed to install/upgrade: installed ntp package post-installation script subprocess returned error exit status 1

[shaho ahmed]

while installing the NTP this error occures

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: ntp 1:4.2.8p12+dfsg-3ubuntu4.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sat Jun 26 16:41:45 2021
DuplicateSignature:
 package:ntp:1:4.2.8p12+dfsg-3ubuntu4.20.04.1
 Setting up ntp (1:4.2.8p12+dfsg-3ubuntu4.20.04.1) ...
 The group `ntp' already exists and is not a system group. Exiting.
 dpkg: error processing package ntp (--configure):
  installed ntp package post-installation script subprocess returned error exit status 1
ErrorMessage: installed ntp package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2021-06-24 (2 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
NtpStatus: ntpq: read: Connection refused
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic root=UUID=fa3cbf2e-ae5e-47dc-824e-c36bf24bcfce ro quiet splash
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.5
SourcePackage: ntp
Title: package ntp 1:4.2.8p12+dfsg-3ubuntu4.20.04.1 failed to install/upgrade: installed ntp package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)