Why won't Ubuntu Software Center launch on KDE Neon?

Question

linux

Ubuntu Software Center gives error when starting

/usr/bin/software-center:25: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk, GObject
ERROR:root:DebFileApplication import
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/db/__init__.py", line 6, in <module>
    from .debfile import DebFileApplication, DebFileOpenError
  File "/usr/share/software-center/softwarecenter/db/debfile.py", line 25, in <module>
    from softwarecenter.db.application import Application, AppDetails
  File "/usr/share/software-center/softwarecenter/db/application.py", line 28, in <module>
    import softwarecenter.distro
  File "/usr/share/software-center/softwarecenter/distro/__init__.py", line 201, in <module>
    distro_instance = _get_distro()
  File "/usr/share/software-center/softwarecenter/distro/__init__.py", line 176, in _get_distro
    module = __import__(distro_module_name, globals(), locals(), [], level)
ImportError: No module named neon
Traceback (most recent call last):
  File "/usr/bin/software-center", line 128, in <module>
    from softwarecenter.ui.gtk3.app import SoftwareCenterAppGtk3
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 54, in <module>
    from softwarecenter.db.application import Application
  File "/usr/share/software-center/softwarecenter/db/application.py", line 28, in <module>
    import softwarecenter.distro
  File "/usr/share/software-center/softwarecenter/distro/__init__.py", line 201, in <module>
    distro_instance = _get_distro()
  File "/usr/share/software-center/softwarecenter/distro/__init__.py", line 176, in _get_distro
    module = __import__(distro_module_name, globals(), locals(), [], level)
ImportError: No module named neon

How to fix it?