Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 1071, in watch_debconf_fd_helper
    return callback(source, debconf_condition)
  File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 179, in process_input
    if not self.process_line():
  File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 112, in process_line
    return self.dbfilter.process_line()
  File "/usr/lib/ubiquity/ubiquity/debconffilter.py", line 236, in process_line
    if not input_widgets[0].run(priority, question):
  File "/usr/lib/ubiquity/ubiquity/components/migrationassistant.py", line 99, in run
    if self.errors:
AttributeError: 'MigrationAssistant' object has no attribute 'errors'