Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde-ui.py", line 1410, in watch_debconf_fd_helper_read
    self.debconf_callbacks[source](source, debconf_condition)
  File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 177, in process_input
    if not self.process_line():
  File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 110, in process_line
    return self.dbfilter.process_line()
  File "/usr/lib/ubiquity/ubiquity/debconffilter.py", line 231, in process_line
    if not input_widgets[0].run(priority, question):
  File "/usr/lib/ubiquity/ubiquity/components/partman.py", line 740, in run
    None, request['method'])
  File "/usr/lib/ubiquity/ubiquity/components/partman.py", line 130, in preseed_script
    question, menu_options, want_script, want_arg)
  File "/usr/lib/ubiquity/ubiquity/components/partman.py", line 125, in must_find_one_script
    (question, want_script, want_arg))
PartmanOptionError: partman-target/choose_method should have None (dont_use) option