Thread: software center

hi friends, i'm new in ubuntu , ı had face face problem ubuntu software center.
when trying open software center seemed busy , not running. when ı tried terminal "software-center" results in below :

~$ software-center
2013-04-20 21:40:11,781 - softwarecenter.ui.gtk3.app - info - setting proxy 'none'
2013-04-20 21:40:11,788 - softwarecenter.db.database - info - open() database: path=none use_axi=true use_agent=true
2013-04-20 21:40:12,677 - softwarecenter.backend.reviews - warning - not usefulness server, no username in config file
2013-04-20 21:40:12,686 - softwarecenter.fixme - warning - logs root logger: '('/usr/lib/python2.7/dist-packages/gi/importer.py', 51, 'find_module')'
2013-04-20 21:40:12,685 - root - error - not find typelib launchpadintegration
2013-04-20 21:40:12,848 - softwarecenter.ui.gtk3.app - info - show_available_packages: search_text '', app none.
2013-04-20 21:40:13,213 - 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 257, in open
self._cache = apt.cache(progress)
file "/usr/lib/python2.7/dist-packages/apt/cache.py", line 102, in __init__
self.open(progress)
file "/usr/lib/python2.7/dist-packages/apt/cache.py", line 149, in open
self._list.read_main_list()
systemerror: e:malformed line 56 in source list /etc/apt/sources.list (dist parse)
2013-04-20 21:40:14,176 - 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 277, 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 182, in <module>
app.run(args)
file "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1387, in run
self.show_available_packages(args)
file "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1325, in show_available_packages
self.view_manager.set_active_view(viewpages.availa ble)
file "/usr/share/software-center/softwarecenter/ui/gtk3/session/viewmanager.py", line 151, in set_active_view
view_widget.init_view()
file "/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", line 173, 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 324, in build
self._build_homepage_view()
file "/usr/share/software-center/softwarecenter/ui/gtk3/views/lobbyview.py", line 119, in _build_homepage_view
self._append_whats_new()
file "/usr/share/software-center/softwarecenter/ui/gtk3/views/lobbyview.py", line 253, in _append_whats_new
whats_new_cat = self._update_whats_new_content()
file "/usr/share/software-center/softwarecenter/ui/gtk3/views/lobbyview.py", line 238, 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 277, in __contains__
return self._cache.__contains__(k)
attributeerror: 'nonetype' object has no attribute '__contains__'
can me ?

hello. problem try these ones: sudo apt-get update -f sudo apt-get update. or try synaptic. reinstall synaptic , see if works. synaptic type in terminal: sudo apt-get install synaptic. that's it.

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