Installation Ver 6.06 LTS for PC crashed during assignment of partitions

On my HP XH226 laptop, I booted the installation CD from ubuntu (obtained in snail mail) and double clicked on the install desktop icon.
I deleted my old partitions, then created
(boot) 50MB as primary ext3
(swap) 1GB - primary linux-swap
(/) 10GB - primary ext
(/home) rest of 30GB - extended-ext3

At the step of assigning the boot, swap, /, and /home partitions, the installation process crashed and provided the following popup information:

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/ubiquity/frontend/gtkui.py", line 620, in on_list_changed
    self.size_widgets[index].set_text(self.set_size_msg(self.partition_widgets[index]))
  File "/usr/lib/python2.4/site-packages/ubiquity/frontend/gtkui.py", line 473, in set_size_msg
    size = float(self.size[self.part_devices[widget.get_active_text()].split('/')[2]])
KeyError: 'hda2'