[Bug 1855356] [NEW] Importing lib2to3 fails with Python 3.8 on Ubuntu 18.04

[Adam McKenna]

Public bug reported:

lib2to3 is part of standard library, so this should not happen.

$ python3.8
Python 3.8.0 (default, Oct 28 2019, 16:14:01)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import lib2to3
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'lib2to3'
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
  File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
    from apport.report import Report
  File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
    import apport.fileutils
  File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
    from apport.packaging_impl import impl as packaging
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
    import apt
  File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'

Original exception was:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'lib2to3'
>>>

$ python3.7
Python 3.7.3 (default, Apr  3 2019, 19:16:38)
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import lib2to3
>>> lib2to3.__file__
'/usr/lib/python3.7/lib2to3/__init__.py'

** Affects: python3.8 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1855356

Title:
  Importing lib2to3 fails with Python 3.8 on Ubuntu 18.04

Status in python3.8 package in Ubuntu:
  New

Bug description:
  lib2to3 is part of standard library, so this should not happen.

  $ python3.8
  Python 3.8.0 (default, Oct 28 2019, 16:14:01)
  [GCC 8.3.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import lib2to3
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  ModuleNotFoundError: No module named 'lib2to3'
  Error in sys.excepthook:
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
      from apport.fileutils import likely_packaged, get_recent_crashes
    File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
      from apport.report import Report
    File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
      import apport.fileutils
    File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
      from apport.packaging_impl import impl as packaging
    File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
      import apt
    File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
      import apt_pkg
  ModuleNotFoundError: No module named 'apt_pkg'

  Original exception was:
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  ModuleNotFoundError: No module named 'lib2to3'
  >>>

  $ python3.7
  Python 3.7.3 (default, Apr  3 2019, 19:16:38)
  [GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import lib2to3
  >>> lib2to3.__file__
  '/usr/lib/python3.7/lib2to3/__init__.py'

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