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

[Francis Ginther]

** Tags added: id-5e4eb982f81e3673a2d90aa6

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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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