Traceback (most recent call last):
  File "/usr/sbin/update-apt-xapian-index", line 631, in <module>
    addons = readPlugins(PLUGINDIR, progress)
  File "/usr/sbin/update-apt-xapian-index", line 278, in readPlugins
    addon = Addon(file)
  File "/usr/sbin/update-apt-xapian-index", line 246, in __init__
    self.info = self.obj.info()
  File "/usr/share/apt-xapian-index/plugins/origin.py", line 26, in info
    file = apt.apt_pkg.Config.find_file("Dir::Cache::pkgcache")
AttributeError: find_file