Traceback (most recent call last):
  File "/usr/share/ubiquity/plugininstall.py", line 1438, in <module>
    install = Install()
  File "/usr/share/ubiquity/plugininstall.py", line 107, in __init__
    if self.db.get('apt-setup/restricted') == 'false':
  File "/usr/lib/python2.7/dist-packages/debconf.py", line 65, in <lambda>
    lambda *args, **kw: self.command(command, *args, **kw))
  File "/usr/lib/python2.7/dist-packages/debconf.py", line 70, in command
    self.write.flush()
IOError: [Errno 32] Broken pipe