[Bug 1863532] Re: Invoking "python" brings inappropriate response from command-not-found when python3 installed

[Bill (franksmcb)]

Using 20.04 current build still see:

$ python

Command 'python' not found, but can be installed with:

If I run sudo apt install python

Package python is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  python2-minimal:i386 python2:i386 python2-minimal python2 2to3

E: Package 'python' has no installation candidate

This has an effect on an upgrade to 20.04 of uninstalling any package
that depends on "python" for example slack-desktop.

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https://bugs.launchpad.net/bugs/1863532

Title:
  Invoking "python" brings inappropriate response from command-not-found
  when python3 installed

Status in command-not-found package in Ubuntu:
  Triaged
Status in python3-defaults package in Ubuntu:
  Triaged
Status in command-not-found source package in Focal:
  Triaged
Status in python3-defaults source package in Focal:
  Triaged

Bug description:
  Ubuntu Mate 20.04 development release, upgraded from 19.10. I don't
  have python 2.7 installed, but have python 3 installed as per default.

  Please see ascii-cast at
  https://asciinema.org/a/SZR20NHz2FN6N6O1hj2Mqmnv8 .

  Running `python` brings up text from command-not-found which suggests
  installing `python3` as a solution to the missing command. `python3`
  is already installed, is a later version than the one indicated by
  command-not-found and does not supply a binary or symlink named
  `python`.

  $ apt policy python
  python:
    Installed: (none)
    Candidate: (none)
    Version table:
       2.7.17-1 -1
          100 /var/lib/dpkg/status
  $ apt policy python3
  python3:
    Installed: 3.8.0-3
    Candidate: 3.8.0-3
    Version table:
   *** 3.8.0-3 500
          500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status
  $ apt policy command-not-found
  command-not-found:
    Installed: 19.10.0
    Candidate: 19.10.0
    Version table:
   *** 19.10.0 500
          500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages
          500 http://gb.archive.ubuntu.com/ubuntu focal/main i386 Packages
          100 /var/lib/dpkg/status

  I don't know whether this is a bug in python3 or command-not-found
  (the latter of which doesn't seem to have been updated for 20.04 yet).
  i don't know if it is intentional that `python3` will not provide a
  binary or symlink named `python`. if that is the case, the output of
  `command-not-found` should be updated to reflect that.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: python3 3.8.0-3
  ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
  Uname: Linux 5.4.0-14-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Mon Feb 17 01:35:16 2020
  InstallationDate: Installed on 2019-10-11 (128 days ago)
  InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Beta amd64 (20190926.2)
  SourcePackage: python3-defaults
  UpgradeStatus: Upgraded to focal on 2020-02-07 (10 days ago)

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