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I have installed Ubuntu-12.0.4 on my desktop. Initially, the software
centre worked well. But now after clicking on it it is trying to open
and within few seconds it is crashes.

Error messages:
======================================================================
2012-07-02 11:50:41,369 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 
'None'
2012-07-02 11:50:41,398 - softwarecenter.db.database - INFO - open() database: 
path=None use_axi=True use_agent=True
2012-07-02 11:50:41,669 - softwarecenter.backend.reviews - WARNING - Could not 
get usefulness from server, no username in config file
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", 
line 242, in open
    self._cache = apt.Cache(GtkMainIterationProgress())
  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 57 in source list /etc/apt/sources.list (dist 
parse)
2012-07-02 11:50:46,610 - 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 262, 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 176, in <module>
    app.run(args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1341, 
in run
    self.show_available_packages(args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1271, 
in show_available_packages
    self.view_manager.set_active_view(ViewPages.AVAILABLE)
  File 
"/usr/share/software-center/softwarecenter/ui/gtk3/session/viewmanager.py", 
line 149, in set_active_view
    view_widget.init_view()
  File 
"/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", 
line 165, in init_view
    self.apps_filter)
  File 
"/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 
240, in __init__
    self.build(desktopdir)
  File 
"/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 
491, in build
    self._build_homepage_view()
  File 
"/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 
266, in _build_homepage_view
    self._append_whats_new()
  File 
"/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 
430, in _append_whats_new
    whats_new_cat = self._update_whats_new_content()
  File 
"/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 
419, in _update_whats_new_content
    docs = whats_new_cat.get_documents(self.db)
  File "/usr/share/software-center/softwarecenter/db/categories.py", line 124, 
in get_documents
    nonblocking_load=False)
  File "/usr/share/software-center/softwarecenter/db/enquire.py", line 317, in 
set_query
    self._blocking_perform_search()
  File "/usr/share/software-center/softwarecenter/db/enquire.py", line 212, 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 262, in __contains__
    return self._cache.__contains__(k)
AttributeError: 'NoneType' object has no attribute '__contains__'

======================================================================

Please do the needful.

Thanks & Regards
Ramesh Naidu

** Affects: software-center (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Ubuntu software centre crashes
https://bugs.launchpad.net/bugs/1019952
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