Installer crashed at 'manual partition'

Binary package hint: ubiquity

This appeared as I selected 'manual partition' in step 4 of the installer.

Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde-ui.py", line 2559, in data
    return QVariant(item.data(index.column()))
  File "/usr/lib/ubiquity/ubiquity/frontend/kde-ui.py", line 2655, in data
    return QVariant(self.partman_column_name())
  File "/usr/lib/ubiquity/ubiquity/frontend/kde-ui.py", line 2686, in partman_column_name
    return ' %s' % get_string('partman/text/unusable', self.locale)
AttributeError: TreeItem instance has no attribute 'locale'

Attempting install on emachines M6810 with Kubuntu daily build 20070401 amd_64.
This is a regression. daily build 20070322.1 installed without problems.