installer crash - dapper livecd beta 2

[Tyrael]

Toshiba Portégé M200
External DVD drive LaCie USB

The Live System starts without problems.
I start the installer. After adjust date and time (I adjust the timezone in the installer and I click synconizes now, then I make the same in the live system and then I return to the installer) I press forward and the installer crashed.

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/ubiquity/frontend/gtkui.py", line 1061, in watch_debconf_fd_helper
    return callback(source, debconf_condition)
  File "/usr/lib/python2.4/site-packages/ubiquity/filteredcommand.py", line 141, in process_input
    if not self.process_line():
  File "/usr/lib/python2.4/site-packages/ubiquity/filteredcommand.py", line 80, in process_line
    return self.dbfilter.process_line()
  File "/usr/lib/python2.4/site-packages/ubiquity/debconffilter.py", line 208, in process_line
    if not input_widgets[0].run(priority, question):
  File "/usr/lib/python2.4/site-packages/ubiquity/components/kbd_chooser.py", line 61, in run
    self.debug("Display map: %s", self.choices_display_map(question))
  File "/usr/lib/python2.4/site-packages/ubiquity/filteredcommand.py", line 197, in choices_display_map
    choices = self.choices(question)
  File "/usr/lib/python2.4/site-packages/ubiquity/filteredcommand.py", line 186, in choices
    choices = unicode(self.db.metaget(question, 'choices'), 'utf-8')
  File "/usr/lib/python2.4/site-packages/debconf.py", line 58, in <lambda>
    lambda *args, **kw: self.command(command, *args, **kw))
  File "/usr/lib/python2.4/site-packages/debconf.py", line 64, in command
    resp = self.read.readline().strip()
IOError: [Errno 4] Interrupted system call