package python3-et-xmlfile 1.0.1-2.1 failed to install/upgrade: installed python3-et-xmlfile package pre-removal script subprocess returned error exit status 127

[shivani]

dpkg error code 1
error in apt-get update
error in installing python again after uninstalling

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: python3-et-xmlfile 1.0.1-2.1
ProcVersionSignature: Ubuntu 5.4.0-62.70-generic 5.4.78
Uname: Linux 5.4.0-62-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu Apr 22 20:24:11 2021
Dependencies:

DuplicateSignature:
 package:python3-et-xmlfile:1.0.1-2.1
 Removing python3-et-xmlfile (1.0.1-2.1) ...
 /var/lib/dpkg/info/python3-et-xmlfile.prerm: 6: py3clean: not found
 dpkg: error processing package python3-et-xmlfile (--remove):
  installed python3-et-xmlfile package pre-removal script subprocess returned error exit status 127
ErrorMessage: installed python3-et-xmlfile package pre-removal script subprocess returned error exit status 127
PackageArchitecture: all
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, unpackaged
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.5
SourcePackage: python-et-xmlfile
Title: package python3-et-xmlfile 1.0.1-2.1 failed to install/upgrade: installed python3-et-xmlfile package pre-removal script subprocess returned error exit status 127
UpgradeStatus: Upgraded to focal on 2021-01-19 (93 days ago)