Traceback (most recent call last):
  File "/usr/bin/software-center", line 80, in <module>
    app = SoftwareCenterApp(datadir, xapian_base_path)
  File "/usr/share/software-center/softwarecenter/app.py", line 123, in __init__
    self.db.open()
  File "/usr/share/software-center/softwarecenter/db/database.py", line 78, in open
    self.xapiandb = xapian.Database(self._db_pathname)
  File "/usr/lib/python2.6/dist-packages/xapian.py", line 2454, in __init__
    _xapian.Database_swiginit(self,_xapian.new_Database(*args))
DatabaseOpeningError: Couldn't detect type of database