Crashed when trying to put in mountpoint in partitioner

Futher problems in the manual partitioner - this is after I click OK after setting / partition up

Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde-ui.py", line 1329, in watch_debconf_fd_helper_read
    self.debconf_callbacks[source](source, debconf_condition)
  File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 176, in process_input
    if not self.process_line():
  File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 110, in process_line
    return self.dbfilter.process_line()
  File "/usr/lib/ubiquity/ubiquity/debconffilter.py", line 231, in process_line
    if not input_widgets[0].run(priority, question):
  File "/usr/lib/ubiquity/ubiquity/components/partman.py", line 795, in run
    self.preseed(question, request['mountpoint'])
  File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 274, in preseed
    value = value.encode("UTF-8", "ignore")
AttributeError: encode

I'm pretty sure this is what Jonathan fixed in ubiquity 1.3.24:

ubiquity (1.3.24) feisty; urgency=low

  * KDE Frontend:
    - Fix type problems in partition edit dialogue

 -- Jonathan Riddell <email address hidden> Thu, 1 Mar 2007 17:41:47 +0000

Could you try upgrading ubiquity to the current version before starting the installation (or just using the Herd 5 milestone release) and tell me whether you can still reproduce this?

I had managed to install using an automatic partitioning after doing this. Running the installer again but clicking "Cancel" after I have set up a pretend partition over my old swap partition so not to write the changes this time led to the same error as in my first report.

Before doing this I ran the commands
apt-get update
apt-get install ubiquity

Which pulled down the latest version and a few dependancies

Some other info in case this is relevent:
I'm booting with noapic apci=off
If I think of anything else I'll add more

Is this still an issue in a more recent version of Kubuntu?

This is not present in the latest release, as far as I can tell.