[Bug 2038666] [NEW] libpython3.11-testsuite cannot be installed on Kubuntu 23.10

[Paul White]

Public bug reported:

A recent update to python3.11 (to version 3.11.6) stopped the update
process from completing with errors telling me that python3-full and
python3.11-full could not be installed.

After a full reinstall of Kubuntu 23.10 without installing any
unnecessary Python packages I am met with the same problem, that is
libpython3.11-testsuite cannot be installed. The following is an extract
of the console output when trying to install the package directly rather
than as a dependency of the python3.11-full:

Selecting previously unselected package libpython3.11-testsuite.
Preparing to unpack .../libpython3.11-testsuite_3.11.6-1_all.deb ...
Unpacking libpython3.11-testsuite (3.11.6-1) ...
Setting up net-tools (2.10-0.1ubuntu3) ...
Setting up libpython3.11-testsuite (3.11.6-1) ...
  File "/usr/lib/python3.11/test/test_future_stmt/badsyntax_future10.py", line 3
    from __future__ import print_function
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: from __future__ imports must occur at the beginning of the file
dpkg: error processing package libpython3.11-testsuite (--configure):
 installed libpython3.11-testsuite package post-installation script subprocess returned error exit status 1
Processing triggers for man-db (2.11.2-3) ...
Errors were encountered while processing:
 libpython3.11-testsuite
E: Sub-process /usr/bin/dpkg returned an error code (1)
Setting up libpython3.11-testsuite (3.11.6-1) ...
  File "/usr/lib/python3.11/test/test_future_stmt/badsyntax_future10.py", line 3
    from __future__ import print_function
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: from __future__ imports must occur at the beginning of the file
dpkg: error processing package libpython3.11-testsuite (--configure):
 installed libpython3.11-testsuite package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 libpython3.11-testsuite 

I don't need this package installed but it was the source of an error
that prevented me from successfully updating a working installation.

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: libpython3.11-testsuite 3.11.6-1
ProcVersionSignature: Ubuntu 6.5.0-7.7-generic 6.5.3
Uname: Linux 6.5.0-7-generic x86_64
ApportVersion: 2.27.0-0ubuntu4
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Fri Oct  6 15:45:12 2023
InstallationDate: Installed on 2023-10-06 (0 days ago)
InstallationMedia: Kubuntu 23.10 "Mantic Minotaur" - Daily amd64 (20231006)
PackageArchitecture: all
SourcePackage: python3.11
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: python3.11 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug mantic

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https://bugs.launchpad.net/bugs/2038666

Title:
  libpython3.11-testsuite cannot be installed on Kubuntu 23.10

Status in python3.11 package in Ubuntu:
  New

Bug description:
  A recent update to python3.11 (to version 3.11.6) stopped the update
  process from completing with errors telling me that python3-full and
  python3.11-full could not be installed.

  After a full reinstall of Kubuntu 23.10 without installing any
  unnecessary Python packages I am met with the same problem, that is
  libpython3.11-testsuite cannot be installed. The following is an
  extract of the console output when trying to install the package
  directly rather than as a dependency of the python3.11-full:

  Selecting previously unselected package libpython3.11-testsuite.
  Preparing to unpack .../libpython3.11-testsuite_3.11.6-1_all.deb ...
  Unpacking libpython3.11-testsuite (3.11.6-1) ...
  Setting up net-tools (2.10-0.1ubuntu3) ...
  Setting up libpython3.11-testsuite (3.11.6-1) ...
    File "/usr/lib/python3.11/test/test_future_stmt/badsyntax_future10.py", line 3
      from __future__ import print_function
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  SyntaxError: from __future__ imports must occur at the beginning of the file
  dpkg: error processing package libpython3.11-testsuite (--configure):
   installed libpython3.11-testsuite package post-installation script subprocess returned error exit status 1
  Processing triggers for man-db (2.11.2-3) ...
  Errors were encountered while processing:
   libpython3.11-testsuite
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  Setting up libpython3.11-testsuite (3.11.6-1) ...
    File "/usr/lib/python3.11/test/test_future_stmt/badsyntax_future10.py", line 3
      from __future__ import print_function
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  SyntaxError: from __future__ imports must occur at the beginning of the file
  dpkg: error processing package libpython3.11-testsuite (--configure):
   installed libpython3.11-testsuite package post-installation script subprocess returned error exit status 1
  Errors were encountered while processing:
   libpython3.11-testsuite 

  I don't need this package installed but it was the source of an error
  that prevented me from successfully updating a working installation.

  ProblemType: Bug
  DistroRelease: Ubuntu 23.10
  Package: libpython3.11-testsuite 3.11.6-1
  ProcVersionSignature: Ubuntu 6.5.0-7.7-generic 6.5.3
  Uname: Linux 6.5.0-7-generic x86_64
  ApportVersion: 2.27.0-0ubuntu4
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Fri Oct  6 15:45:12 2023
  InstallationDate: Installed on 2023-10-06 (0 days ago)
  InstallationMedia: Kubuntu 23.10 "Mantic Minotaur" - Daily amd64 (20231006)
  PackageArchitecture: all
  SourcePackage: python3.11
  UpgradeStatus: No upgrade log present (probably fresh install)

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