Ошибка Python при открытии центра программного обеспечения

Мой центр программного обеспечения внезапно не работа. Когда я пытался открыть его от средства запуска, его единственной загрузки, но показа ничего.

Я попытался выполнить его от терминала и получил эту ошибку:

Traceback (most recent call last):
  File "/usr/bin/software-center", line 36, in <module>
    from softwarecenter.utils import (
  File "/usr/share/software-center/softwarecenter/utils.py", line 19, in <module>
    import dbus
  File "/usr/lib/python2.7/dist-packages/dbus/__init__.py", line 103, in <module>
    from dbus._dbus import Bus, SystemBus, SessionBus, StarterBus
  File "/usr/lib/python2.7/dist-packages/dbus/_dbus.py", line 39, in <module>
    from dbus.bus import BusConnection
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 39, in <module>
    from dbus.connection import Connection
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 37, in <module>
    from dbus.proxies import ProxyObject
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 34, in <module>
    from dbus._expat_introspect_parser import process_introspection_data
  File "/usr/lib/python2.7/dist-packages/dbus/_expat_introspect_parser.py", line 26, in <module>
    from xml.parsers.expat import ParserCreate
  File "/usr/lib/python2.7/xml/parsers/expat.py", line 4, in <module>
    from pyexpat import *
ImportError: /usr/lib/python2.7/lib-dynload/pyexpat.x86_64-linux-gnu.so: undefined symbol: XML_SetHashSalt
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
  File "/usr/lib/python2.7/dist-packages/apport/__init__.py", line 5, in <module>
    from apport.report import Report
  File "/usr/lib/python2.7/dist-packages/apport/report.py", line 16, in <module>
    from xml.parsers.expat import ExpatError
  File "/usr/lib/python2.7/xml/parsers/expat.py", line 4, in <module>
    from pyexpat import *
ImportError: /usr/lib/python2.7/lib-dynload/pyexpat.x86_64-linux-gnu.so: undefined symbol: XML_SetHashSalt

Original exception was:
Traceback (most recent call last):
  File "/usr/bin/software-center", line 36, in <module>
    from softwarecenter.utils import (
  File "/usr/share/software-center/softwarecenter/utils.py", line 19, in <module>
    import dbus
  File "/usr/lib/python2.7/dist-packages/dbus/__init__.py", line 103, in <module>
    from dbus._dbus import Bus, SystemBus, SessionBus, StarterBus
  File "/usr/lib/python2.7/dist-packages/dbus/_dbus.py", line 39, in <module>
    from dbus.bus import BusConnection
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 39, in <module>
    from dbus.connection import Connection
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 37, in <module>
    from dbus.proxies import ProxyObject
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 34, in <module>
    from dbus._expat_introspect_parser import process_introspection_data
  File "/usr/lib/python2.7/dist-packages/dbus/_expat_introspect_parser.py", line 26, in <module>
    from xml.parsers.expat import ParserCreate
  File "/usr/lib/python2.7/xml/parsers/expat.py", line 4, in <module>
    from pyexpat import *
ImportError: /usr/lib/python2.7/lib-dynload/pyexpat.x86_64-linux-gnu.so: undefined symbol: XML_SetHashSalt

Если я помню правильно, я ничего не делаю с библиотекой Python. Я сделал некоторый поиск с помощью Google и людей, которые, как сказали, сделали apt-get update & upgrade. Я судил их, но никакую удачу.

ОБНОВЛЕНИЕ

Я пытался переустановить python & software-center использование:

sudo apt-get install --reinstall python2.7
sudo apt-get install --reinstall software-center

Но ошибка все еще сохраняется

Спасибо за внимание.