[Bug 1945854] Re: package python3-lib2to3 3.8.10-0ubuntu1~20.04 failed to install/upgrade: installed python3-lib2to3 package post-installation script subprocess returned error exit status 2

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** Tags removed: need-duplicate-check

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Title:
  package python3-lib2to3 3.8.10-0ubuntu1~20.04 failed to
  install/upgrade: installed python3-lib2to3 package post-installation
  script subprocess returned error exit status 2

Status in python3-stdlib-extensions package in Ubuntu:
  New

Bug description:
  I have previously installed python3 using miniconda, and wonder if
  somehow that could conflict with this upgrade?

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: python3-lib2to3 3.8.10-0ubuntu1~20.04
  ProcVersionSignature: Ubuntu 5.11.0-27.29~20.04.1-generic 5.11.22
  Uname: Linux 5.11.0-27-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.20
  AptOrdering:
   ncurses-term:amd64: Install
   openssh-sftp-server:amd64: Install
   openssh-server:amd64: Install
   ssh-import-id:amd64: Install
   NULL: ConfigurePending
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Sat Oct  2 11:47:42 2021
  Dependencies:
   
  DpkgHistoryLog:
   Start-Date: 2021-10-02  11:47:37
   Commandline: apt-get install openssh-server
   Requested-By: craig (1000)
   Install: openssh-sftp-server:amd64 (1:8.2p1-4ubuntu0.3, automatic), ncurses-term:amd64 (6.2-0ubuntu2, automatic), openssh-server:amd64 (1:8.2p1-4ubuntu0.3), ssh-import-id:amd64 (5.10-0ubuntu1, automatic)
  DuplicateSignature:
   package:python3-lib2to3:3.8.10-0ubuntu1~20.04
   Setting up python3-lib2to3 (3.8.10-0ubuntu1~20.04) ...
   /usr/bin/python3.9: can't open file '/usr/lib/python3.9/py_compile.py': [Errno 2] No such file or directory
   dpkg: error processing package python3-lib2to3 (--configure):
    installed python3-lib2to3 package post-installation script subprocess returned error exit status 2
  ErrorMessage: installed python3-lib2to3 package post-installation script subprocess returned error exit status 2
  InstallationDate: Installed on 2020-06-23 (465 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.8, Python 3.8.10, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.6
  SourcePackage: python3-stdlib-extensions
  Title: package python3-lib2to3 3.8.10-0ubuntu1~20.04 failed to install/upgrade: installed python3-lib2to3 package post-installation script subprocess returned error exit status 2
  UpgradeStatus: No upgrade log present (probably fresh install)

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