kubuntu ubiquity crashes on hw-detect

Binary package hint: ubiquity

Kubuntu Ubiquity crashes near the end of it's install.

Traceback (most recent call last):
  File "/usr/bin/ubiquity", line 134, in ?
    install()
  File "/usr/bin/ubiquity", line 57, in install
    ret = wizard.run()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 266, in run
    self.process_step()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 746, in process_step
    self.mountpoints_to_summary()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 1051, in mountpoints_to_summary
    self.progress_loop()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 541, in progress_loop
    raise RuntimeError, ("Install failed with exit code %s\n%s" %
RuntimeError: Install failed with exit code 1
Traceback (most recent call last):
  File "/usr/share/ubiquity/install.py", line 1215, in ?
    install.run()
  File "/usr/share/ubiquity/install.py", line 304, in run
    self.configure_hardware()
  File "/usr/share/ubiquity/install.py", line 785, in configure_hardware
    raise InstallStepError("HwDetect failed with code %d" % code)
NameError: global name 'code' is not defined

From /var/log/installer/syslog:

ubiquity: Starting up '['/usr/lib/ubiquity/user-setup/user-setup-apply', '/target']' for ubiquity.components.usersetup_apply.UserSetupApply
ubiquity: Starting up '['/bin/hw-detect']' for ubiquity.components.hw_detect.HwDetect
/bin/hw-detect: 372: /lib/debian-installer/coldplug: not found
ubiquity: ['/bin/hw-detect'] exited with code 127
Exception during installation:

This also happens with ubiquity-gtk running from the Kubuntu CD, but doesn't happen from the Ubuntu CD.