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/descriptions.py", line 26, in info
    return dict(timestamp = os.path.getmtime(file))
  File "/usr/lib/python2.6/genericpath.py", line 54, in getmtime
    return os.stat(filename).st_mtime
OSError: [Errno 2] No such file or directory: '/var/cache/apt/pkgcache.bin'