Thanks for your bugreport.

Could you please attach the update-manager output as well? Could you please 
please see if you can get this segfault to be reported via "apport" ? this way 
we can get a backtrace of the crash, but the output indicates that something 
deep within your
pygi install is not working.

** Changed in: software-center (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/976901

Title:
  software-center and update manager segfaults

Status in “software-center” package in Ubuntu:
  Incomplete

Bug description:
  When trying to launch software center or update manager, get
  following:

  /usr/share/software-center/softwarecenter/view/widgets/mkit.py:140: Warning: 
instance with invalid (NULL) class pointer
    EM = get_em_value()
  /usr/share/software-center/softwarecenter/view/widgets/mkit.py:140: Warning: 
g_signal_handlers_destroy: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
    EM = get_em_value()
  2012-04-09 00:24:03,831 - softwarecenter.fixme - WARNING - logs to the root 
logger: '('/usr/share/software-center/softwarecenter/db/database.py', 96, 
'open')'
  2012-04-09 00:24:03,831 - root - WARNING - failed to add sca db Couldn't 
detect type of database
  /usr/share/software-center/softwarecenter/view/appview.py:1192: Warning: 
instance of invalid non-instantiatable type `<invalid>'
    tr.set_button_spacing(int(get_em_value()*0.3+0.5))
  /usr/share/software-center/softwarecenter/view/appview.py:1192: Warning: 
g_signal_handlers_destroy: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
    tr.set_button_spacing(int(get_em_value()*0.3+0.5))
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1250: 
GtkWarning: IA__gtk_widget_get_realized: assertion `GTK_IS_WIDGET (widget)' 
failed
    self.screenshot = ScreenshotView(self.distro, self.icons)
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1250: 
Warning: instance of invalid non-instantiatable type `<invalid>'
    self.screenshot = ScreenshotView(self.distro, self.icons)
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1250: 
Warning: g_signal_emit_valist: assertion `G_TYPE_CHECK_INSTANCE (instance)' 
failed
    self.screenshot = ScreenshotView(self.distro, self.icons)
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1250: 
Warning: g_signal_handlers_destroy: assertion `G_TYPE_CHECK_INSTANCE 
(instance)' failed
    self.screenshot = ScreenshotView(self.distro, self.icons)
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1254: 
GtkWarning: IA__gtk_widget_get_realized: assertion `GTK_IS_WIDGET (widget)' 
failed
    self.homepage_btn = mkit.HLinkButton(_('Website'))
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1254: 
Warning: instance with invalid (NULL) class pointer
    self.homepage_btn = mkit.HLinkButton(_('Website'))
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1254: 
Warning: g_signal_emit_valist: assertion `G_TYPE_CHECK_INSTANCE (instance)' 
failed
    self.homepage_btn = mkit.HLinkButton(_('Website'))
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1254: 
Warning: g_signal_handlers_destroy: assertion `G_TYPE_CHECK_INSTANCE 
(instance)' failed
    self.homepage_btn = mkit.HLinkButton(_('Website'))
  /usr/share/software-center/softwarecenter/view/widgets/mkit.py:1100: Warning: 
invalid uninstantiatable type `(null)' in cast to `GtkLabel'
    self.label.set_markup('<u>%s</u>' % self.label.get_text())
  /usr/share/software-center/softwarecenter/view/widgets/mkit.py:1100: 
GtkWarning: IA__gtk_label_get_text: assertion `GTK_IS_LABEL (label)' failed
    self.label.set_markup('<u>%s</u>' % self.label.get_text())
  /usr/share/software-center/softwarecenter/view/widgets/mkit.py:1100: 
GtkWarning: IA__gtk_label_set_markup: assertion `GTK_IS_LABEL (label)' failed
    self.label.set_markup('<u>%s</u>' % self.label.get_text())
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1261: 
GtkWarning: IA__gtk_widget_get_realized: assertion `GTK_IS_WIDGET (widget)' 
failed
    self.share_btn = mkit.HLinkButton(_('Share...'))
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1261: 
Warning: instance of invalid non-instantiatable type `<invalid>'
    self.share_btn = mkit.HLinkButton(_('Share...'))
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1261: 
Warning: g_signal_emit_valist: assertion `G_TYPE_CHECK_INSTANCE (instance)' 
failed
    self.share_btn = mkit.HLinkButton(_('Share...'))
  /usr/share/software-center/softwarecenter/view/appdetailsview_gtk.py:1261: 
Warning: g_signal_handlers_destroy: assertion `G_TYPE_CHECK_INSTANCE 
(instance)' failed
    self.share_btn = mkit.HLinkButton(_('Share...'))
  /usr/share/software-center/softwarecenter/view/widgets/mkit.py:1100: Warning: 
invalid uninstantiatable type `<invalid>' in cast to `GtkLabel'
    self.label.set_markup('<u>%s</u>' % self.label.get_text())
  Segmentation fault

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: software-center 3.0.4
  ProcVersionSignature: Ubuntu 2.6.32-39.86-generic 2.6.32.56+drm33.22
  Uname: Linux 2.6.32-39-generic i686
  Architecture: i386
  Date: Mon Apr  9 01:02:19 2012
  InstallationMedia: Ubuntu 10.04.3 LTS "Lucid Lynx" - Release i386 (20110720.1)
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: software-center

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