Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/backend/reviews.py", line 750, in _on_review_stats_data
    self.save_review_stats_cache_file()
  File "/usr/share/software-center/softwarecenter/backend/reviews.py", line 315, in save_review_stats_cache_file
    t.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/share/software-center/softwarecenter/backend/reviews.py", line 323, in _save_review_stats_cache_blocking
    self._dump_bsddbm_for_unity()
  File "/usr/share/software-center/softwarecenter/backend/reviews.py", line 341, in _dump_bsddbm_for_unity
    0600)
DBAgainError: (11, 'Resource temporarily unavailable -- unable to join the environment')