Fails to install after mount point selection

Hi,

Just tried to install i386 Ubuntu from the flight 7 LiveCD and got a crash from the installer. The installer told me to visit this page to report the bug.

I did a more 'advanced' install than most. I used gparted to move Windows out of the way to make room for Ubuntu, then ran the installer (not realising that gparted is part of the installer anyway). After telling the installer I wanted /boot on /dev/hda5, / on hda7 and swap on hda8 and getting to the part where the system is actually installed. The installer crashed. Debug info as follows:

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/ubiquity/frontend/gtkui.py", line 1084, in watch_debconf_fd_helper
    return callback(source, debconf_condition)
  File "/usr/lib/python2.4/site-packages/ubiquity/filteredcommand.py", line 143, in process_input
    if not self.process_line():
  File "/usr/lib/python2.4/site-packages/ubiquity/filteredcommand.py", line 81, in process_line
    return self.dbfilter.process_line()
  File "/usr/lib/python2.4/site-packages/ubiquity/debconffilter.py", line 219, in process_line
    if not input_widgets[0].run(priority, question):
  File "/usr/lib/python2.4/site-packages/ubiquity/components/partman_commit.py", line 123, in run
    ('ubiquity/text/go_back', 'ubiquity/text/continue'))
  File "/usr/lib/python2.4/site-packages/ubiquity/frontend/gtkui.py", line 1463, in question_dialog
    dialog = gtk.Dialog(title, transient, gtk.DIALOG_MODAL, tuple(buttons))
RuntimeError: first member of each text/response id pair must be a string