It seems problem was in custom installed python-2.7 in /usr/local/bin. Not really "vanilla" ubuntu and not ubuntu fault, but maybe should be checked properly (if that possible).
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to python-defaults in Ubuntu. https://bugs.launchpad.net/bugs/1880654 Title: package python2-minimal 2.7.17-2ubuntu4 failed to install/upgrade: installed python2-minimal package post-installation script subprocess returned error exit status 1 Status in python-defaults package in Ubuntu: New Bug description: During upgrade from 18 to 20 it spit this error. ProblemType: Package DistroRelease: Ubuntu 20.04 Package: python2-minimal 2.7.17-2ubuntu4 ProcVersionSignature: Ubuntu 4.15.0-101.102-generic 4.15.18 Uname: Linux 4.15.0-101-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.14 Architecture: amd64 Date: Tue May 26 09:49:11 2020 ErrorMessage: installed python2-minimal package post-installation script subprocess returned error exit status 1 InstallationDate: Installed on 2015-03-15 (1899 days ago) InstallationMedia: Ubuntu-Server 12.04.4 LTS "Precise Pangolin" - Release amd64 (20140204) Python3Details: /usr/bin/python3.6, Python 3.6.9, python3-minimal, 3.6.7-1~18.04 PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4 RelatedPackageVersions: dpkg 1.19.0.5ubuntu2.3 apt 1.6.12ubuntu0.1 SourcePackage: python-defaults Title: package python2-minimal 2.7.17-2ubuntu4 failed to install/upgrade: installed python2-minimal package post-installation script subprocess returned error exit status 1 UpgradeStatus: Upgraded to focal on 2020-05-26 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/python-defaults/+bug/1880654/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
