[Bug 1923656] [NEW] Can't upgrade to Ubuntu 20.04 due to python issues

[Michał Margula]

Public bug reported:

Can't upgrade to Ubuntu 20.04, even with -p switch. Getting plenty of
following messages in apt.log

Broken python-is-python2:amd64 Depends on python2:amd64 < none | 2.7.17-2ubuntu4 @un umH >
  Considering python2:amd64 1 as a solution to python-is-python2:amd64 -1
  Ignore MarkKeep of python-is-python2:amd64 < none -> 2.7.17-4 @un pumN Ib > as its mode (Install) is protected
  Removing python-is-python2:amd64 rather than change python2:amd64
  Ignore MarkDelete of python-is-python2:amd64 < none -> 2.7.17-4 @un pumN Ib > as its mode (Install) is protected

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.42
ProcVersionSignature: Ubuntu 4.15.0-141.145-generic 4.15.18
Uname: Linux 4.15.0-141-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
Date: Tue Apr 13 21:12:59 2021
InstallationDate: Installed on 2018-03-28 (1111 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-04-13 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade

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https://bugs.launchpad.net/bugs/1923656

Title:
  Can't upgrade to Ubuntu 20.04 due to python issues

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Can't upgrade to Ubuntu 20.04, even with -p switch. Getting plenty of
  following messages in apt.log

  Broken python-is-python2:amd64 Depends on python2:amd64 < none | 2.7.17-2ubuntu4 @un umH >
    Considering python2:amd64 1 as a solution to python-is-python2:amd64 -1
    Ignore MarkKeep of python-is-python2:amd64 < none -> 2.7.17-4 @un pumN Ib > as its mode (Install) is protected
    Removing python-is-python2:amd64 rather than change python2:amd64
    Ignore MarkDelete of python-is-python2:amd64 < none -> 2.7.17-4 @un pumN Ib > as its mode (Install) is protected

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-141.145-generic 4.15.18
  Uname: Linux 4.15.0-141-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  Date: Tue Apr 13 21:12:59 2021
  InstallationDate: Installed on 2018-03-28 (1111 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-04-13 (0 days ago)

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