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

[Robie Basak]

> I don't see how that Breaks is relevant. "python" != "python-is-
python2", so python3-yaml having a breaks on *python* (<< 2.7.18)
doesn't have any direct impact on the python-is-python2 package. And
Jammy ships python2 2.7.18-3 anyway.

Sorry, I now see that python-is-python2 Provides "python". But even so,
the version of python-is-python2 provided by Impish is high enough to
avoid that Breaks, no?

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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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