Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/aptdaemon/progress.py", line 177, in fail
    self._emit_acquire_item(item)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/progress.py", line 342, in _emit_acquire_item
    lang_code, region_code = lang.split("_")
UnboundLocalError: local variable 'lang' referenced before assignment