Traceback (most recent call last):
  File "/usr/sbin/update-apt-xapian-index", line 93, in <module>
    indexer.slave()
  File "/usr/lib/pymodules/python2.7/axi/indexer.py", line 413, in slave
    progress.notice("Another update is already running: showing its progress.")
NameError: global name 'progress' is not defined