[Bug 1800287] [NEW] Package python3-mock is not available

[Timm Murray]

Public bug reported:

On a server with a fresh install of Ubuntu 18.04 within the past week,
I'm unable install the python3-mock package:

=========
$ sudo apt-get install python3-mock
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package python3-mock 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

E: Package 'python3-mock' has no installation candidate
=========

I took a stab at installing it manually with "dpkg -i" using the package
at:

http://mirrors.kernel.org/ubuntu/pool/universe/p/python-
mock/python3-mock_2.0.0-3_all.deb

Once I installed the prereq (python3-pbr), I was able to install from
the deb package directly. Some other Python3 packages are giving the
same error (python3-zope.event, python3-configargparse). Doing "apt-
cache search python3" does reveal quite a few packages that are
installable, so I'm not sure why these are an issue.

=======
$ lsb_release -rd
Description:    Ubuntu 18.04.1 LTS
Release:        18.04

** Affects: python-mock (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1800287

Title:
  Package python3-mock is not available

Status in python-mock package in Ubuntu:
  New

Bug description:
  On a server with a fresh install of Ubuntu 18.04 within the past week,
  I'm unable install the python3-mock package:

  =========
  $ sudo apt-get install python3-mock
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Package python3-mock 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

  E: Package 'python3-mock' has no installation candidate
  =========

  I took a stab at installing it manually with "dpkg -i" using the
  package at:

  http://mirrors.kernel.org/ubuntu/pool/universe/p/python-
  mock/python3-mock_2.0.0-3_all.deb

  Once I installed the prereq (python3-pbr), I was able to install from
  the deb package directly. Some other Python3 packages are giving the
  same error (python3-zope.event, python3-configargparse). Doing "apt-
  cache search python3" does reveal quite a few packages that are
  installable, so I'm not sure why these are an issue.

  =======
  $ lsb_release -rd
  Description:    Ubuntu 18.04.1 LTS
  Release:        18.04

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