[Bug 1958720] Re: python3-yaml and python3-six are not co-installable with python-is-python2 in jammy

[Robie Basak]

Oh, now maybe I see what you mean. If upgrading from Focal to Jammy
without going through Impish, you'll have a "too-old" version of python-
is-python2? Let me think about this.

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Title:
  python3-yaml and python3-six are not co-installable with python-is-
  python2 in jammy

Status in pyyaml package in Ubuntu:
  Incomplete
Status in six package in Ubuntu:
  Incomplete

Bug description:
  The packages python3-yaml and python-is-python2 are not co-installable
  in jammy and I believe they should be.  This currently prevents me
  from upgrading one of my machines from focal to jammy.

  Further analysis with the help of Stefano Rivera revealed that what-
  is-python no longer produces a python-is-python2 package and the
  changelog hints at that being intentional.  Jammy still has a python2
  package, though.

  python3-yaml in jammy breaks on python (<2.7.18).  The python-is-
  python2 package in focal is version 2.7.17-4 and in impish it is
  2.7.18-9 and thus will be forcefully removed when going to jammy.

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