Ubuntu 15.10 программное обеспечение center closes immediately after launch

I just installed Ubuntu 15.10 (общее количество newcomer to linux in общий, btw). The center программное обеспечение, эксперт well эксперт the ubuntu updater applications seem to close immediately after opening. the конечный came up with the following reaction to starting программное обеспечение - center:

2015-12-06 19:55:36,309 - softwarecenter.backend.zeitgeist_logger - WARNING - Support for Zeitgeist disabled
2015-12-06 19:55:36,358 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2015-12-06 19:55:36,361 - softwarecenter.db.database - ERROR - failed to add apt-xapian-index
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/db/database.py", line 194, in _get_new_xapiandb
    softwarecenter.paths.APT_XAPIAN_INDEX_DB_PATH)
  File "/usr/lib/python2.7/dist-packages/xapian/__init__.py", line 3667, in __init__
    _xapian.Database_swiginit(self,_xapian.new_Database(*args))
DatabaseOpeningError: Couldn't stat '/var/lib/apt-xapian-index/index' (No such file or directory)
2015-12-06 19:55:36,837 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2015-12-06 19:55:36,840 - softwarecenter.plugin - INFO - activating plugin '<module 'webapps_activation' from '/usr/share/software-center/softwarecenter/plugins/webapps_activation.pyc'>'
2015-12-06 19:55:36,878 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open()
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 261, in open
    self._cache = apt.Cache(progress)
  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 113, in __init__
    self.open(progress)
  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 168, in open
    self._list.read_main_list()
SystemError: E:Type 'sudo' is not known on line 1 in source list /etc/apt/sources.list.d/spotify.list
/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py:190: Warning: Source ID 70 was not found when attempting to remove it
  Gtk.main_iteration()
2015-12-06 19:55:37,523 - softwarecenter.db.enquire - ERROR - _get_estimate_nr_apps_and_nr_pkgs failed
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/db/enquire.py", line 115, in _get_estimate_nr_apps_and_nr_pkgs
    tmp_matches = enquire.get_mset(0, len(self.db), None, xfilter)
  File "/usr/share/software-center/softwarecenter/db/appfilter.py", line 89, in __call__
    if (not pkgname in self.cache and
  File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 281, in __contains__
    return self._cache.__contains__(k)
AttributeError: 'NoneType' object has no attribute '__contains__'
Traceback (most recent call last):
  File "/usr/bin/software-center", line 183, in <module>
    app.run(args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1378, in run
    self.show_available_packages(args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1316, in show_available_packages
    self.view_manager.set_active_view(ViewPages.AVAILABLE)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/session/viewmanager.py", line 150, in set_active_view
    view_widget.init_view()
  File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", line 227, in init_view
    self.cache, self.db, self.icons, self.apps_filter)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/lobbyview.py", line 80, in __init__
    self.build()
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/lobbyview.py", line 326, in build
    self._build_homepage_view()
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/lobbyview.py", line 121, in _build_homepage_view
    self._append_whats_new()
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/lobbyview.py", line 255, in _append_whats_new
    whats_new_cat = self._update_whats_new_content()
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/lobbyview.py", line 240, in _update_whats_new_content
    docs = whats_new_cat.get_documents(self.db)
  File "/usr/share/software-center/softwarecenter/db/categories.py", line 131, in get_documents
    nonblocking_load=False)
  File "/usr/share/software-center/softwarecenter/db/enquire.py", line 330, in set_query
    self._blocking_perform_search()
  File "/usr/share/software-center/softwarecenter/db/enquire.py", line 225, in _blocking_perform_search
    matches = enquire.get_mset(0, self.limit, None, xfilter)
  File "/usr/share/software-center/softwarecenter/db/appfilter.py", line 89, in __call__
    if (not pkgname in self.cache and
  File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 281, in __contains__
    return self._cache.__contains__(k)
AttributeError: 'NoneType' object has no attribute '__contains__'

This is too much info for someone like я. Хан somebody please interpret what's happening to my machine?

PS: I was trying to download the spotify программное обеспечение before attempting to open the программное обеспечение updater. It failed and I don't know why. Maybe it plays в role in what you see...

Thanks! Kaiser