مشکل با software-center

[reza73]

من از نسخه rubuntu استفاده میکنم!!وقتی می خام software-center رو باز کنم این error رو میده!!

ERROR:root:DebFileApplication import
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/db/__init__.py", line 3, in <module>
    from debfile import DebFileApplication
  File "/usr/share/software-center/softwarecenter/db/debfile.py", line 25, in <module>
    from softwarecenter.db.application import Application, AppDetails
  File "/usr/share/software-center/softwarecenter/db/application.py", line 28, in <module>
    from softwarecenter.backend.channel import is_channel_available
  File "/usr/share/software-center/softwarecenter/backend/channel.py", line 25, in <module>
    from softwarecenter.distro import get_distro
  File "/usr/share/software-center/softwarecenter/distro/__init__.py", line 194, in <module>
    distro_instance = _get_distro()
  File "/usr/share/software-center/softwarecenter/distro/__init__.py", line 169, in _get_distro
    module = __import__(distro_id, globals(), locals(), [], -1)
ImportError: No module named Rubuntu
Traceback (most recent call last):
  File "/usr/bin/software-center", line 140, in <module>
    from softwarecenter.ui.gtk3.app import SoftwareCenterAppGtk3
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 49, in <module>
    from softwarecenter.db.application import Application
  File "/usr/share/software-center/softwarecenter/db/application.py", line 28, in <module>
    from softwarecenter.backend.channel import is_channel_available
  File "/usr/share/software-center/softwarecenter/backend/channel.py", line 25, in <module>
    from softwarecenter.distro import get_distro
  File "/usr/share/software-center/softwarecenter/distro/__init__.py", line 194, in <module>
    distro_instance = _get_distro()
  File "/usr/share/software-center/softwarecenter/distro/__init__.py", line 169, in _get_distro
    module = __import__(distro_id, globals(), locals(), [], -1)
ImportError: No module named Rubuntu