package python3-openssl 19.0.0-1build1 failed to install/upgrade: installed python3-openssl package post-installation script subprocess returned error exit status 1

[Compinfer]

repeating errors like
  File "/usr/lib/python3/dist-packages/OpenSSL/SSL.py", line 664, in <module>
    _lib.Cryptography_HAS_TLSEXT_HOSTNAME, "SNI not available"
AttributeError: module 'lib' has no attribute 'Cryptography_HAS_TLSEXT_HOSTNAME'
reinstall of /python3-cryptography_2.8-3ubuntu0.1_amd64.deb, python3-crypto_2.6.1-13ubuntu2_amd64.deb, python3-openssl_19.0.0-1build1_all.deb
doesn't help.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: python3-openssl 19.0.0-1build1
ProcVersionSignature: Ubuntu 5.4.0-56.62-lowlatency 5.4.73
Uname: Linux 5.4.0-56-lowlatency x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.13
AptOrdering:
 lsb-release:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu Dec 10 00:13:46 2020
ErrorMessage: installed python3-openssl package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2019-05-18 (571 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
PackageArchitecture: all
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: pyopenssl
Title: package python3-openssl 19.0.0-1build1 failed to install/upgrade: installed python3-openssl package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.