Comment 5 for bug 888607

I'm trying to fix this, and by killing /usr/lib/unity-lens-files/unity-files-daemon and running it again I can get some output. In particular, when searching I get the following error:

(process:9943): unity-files-daemon-WARNING **: daemon.vala:466: Error performing global search 'in': GDBus.Error:org.freedesktop.DBus.Python.xapian.DatabaseCorruptError: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/service.py", line 702, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/share/zeitgeist/_zeitgeist/engine/extensions/fts.py", line 168, in Search
    offset, count, result_type)
  File "/usr/share/zeitgeist/_zeitgeist/engine/extensions/fts.py", line 109, in newFunction
    return f(*args, **kw)
  File "/usr/share/zeitgeist/_zeitgeist/engine/extensions/fts.py", line 395, in search
    self.QUERY_PARSER_FLAGS)
DatabaseCorruptError: Db block overwritten - are there multiple writers?

So it seems there is a corrupted file. This seemed related to bug #841878, so I use the workaround reported in comment 6 and it worked.