Comment 3 for bug 1043788

I have the same problem, but I actually update the system and it when it happened

To me, terminal show

ben@ben-U31F:~$ software-center
2012-09-08 17:59:27,126 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2012-09-08 17:59:27,230 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True

(software-center:8107): Gtk-WARNING **: Theme parsing error: softwarecenter.css:34:20: Not using units is deprecated. Assuming 'px'.

(software-center:8107): Gtk-WARNING **: Theme parsing error: softwarecenter.css:34:22: Not using units is deprecated. Assuming 'px'.

(software-center:8107): Gtk-WARNING **: Theme parsing error: softwarecenter.css:56:20: Not using units is deprecated. Assuming 'px'.

(software-center:8107): Gtk-WARNING **: Theme parsing error: softwarecenter.css:56:22: Not using units is deprecated. Assuming 'px'.

(software-center:8107): Gtk-WARNING **: Theme parsing error: softwarecenter.css:60:20: Not using units is deprecated. Assuming 'px'.

(software-center:8107): Gtk-WARNING **: Theme parsing error: softwarecenter.css:60:22: Not using units is deprecated. Assuming 'px'.
2012-09-08 17:59:27,827 - softwarecenter.region - WARNING - failed to use geoclue: 'org.freedesktop.Geoclue.Error.notAvailable: Geoclue master client has no usable Address providers'
2012-09-08 17:59:29,434 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2012-09-08 17:59:29,486 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/gi/importer.py', 51, 'find_module')'
2012-09-08 17:59:29,486 - root - ERROR - Could not find any typelib for LaunchpadIntegration
2012-09-08 17:59:29,607 - softwarecenter.ui.gtk3.app - INFO - show_available_packages: search_text is '', app is None.
2012-09-08 17:59:29,660 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open()
Traceback (most recent call last):
  File "/usr/bin/software-center", line 185, in <module>
    app.run(args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1418, in run
    self.show_available_packages(args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1356, in show_available_packages
    self.view_manager.set_active_view(ViewPages.AVAILABLE)
  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 142, in init_view
    SoftwarePane.init_view(self)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/softwarepane.py", line 156, in init_view
    from softwarecenter.ui.gtk3.views.appdetailsview import (
  File "/usr/share/software-center/softwarecenter/ui/gtk3/views/appdetailsview.py", line 57, in <module>
    from softwarecenter.ui.gtk3.widgets.labels import HardwareRequirementsBox
  File "/usr/share/software-center/softwarecenter/ui/gtk3/widgets/labels.py", line 25, in <module>
    class HardwareRequirementsLabel(Gtk.HBox):
  File "/usr/share/software-center/softwarecenter/ui/gtk3/widgets/labels.py", line 34, in HardwareRequirementsLabel
    'no': u'<span foreground="red">%s</span>' % _(u'\u2718'),
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 0: ordinal not in range(128)