Traceback (most recent call last):
  File "/usr/sbin/update-apt-xapian-index", line 102, in <module>
    indexer.incrementalUpdate()
  File "/usr/lib/python2.7/dist-packages/axi/indexer.py", line 665, in incrementalUpdate
    return self.rebuild()
  File "/usr/lib/python2.7/dist-packages/axi/indexer.py", line 715, in rebuild
    self.buildIndex(dbdir, generator)
  File "/usr/lib/python2.7/dist-packages/axi/indexer.py", line 691, in buildIndex
    db.add_document(doc)
DatabaseError: Modifications failed (DatabaseOpeningError: Couldn't open base /var/cache/apt-xapian-index/index.3/postlist.tmp to write: No such file or directory), and cannot set consistent table revision numbers: Couldn't reread base A