Kubuntu Graphic Installer crashes on partitioning of disk

Traceback (most recent call last):
  File "/usr/bin/ubiquity", line 130, in ?
    install(sys.argv[1])
  File "/usr/bin/ubiquity", line 54, in install
    wizard = ui.Wizard(distro)
  File "/usr/lib/python2.4/site-packages/ubiquity/frontend/kde-ui.py", line 158, in __init__
    cloexec=True))
  File "/usr/lib/python2.4/site-packages/debconf.py", line 125, in __init__
    write=self.dccomm.tochild)
  File "/usr/lib/python2.4/site-packages/debconf.py", line 48, in __init__
    self.setUp(title)
  File "/usr/lib/python2.4/site-packages/debconf.py", line 51, in setUp
    self.version = self.version(2)
  File "/usr/lib/python2.4/site-packages/debconf.py", line 60, in <lambda>
    lambda *args, **kw: self.command(command, *args, **kw))
  File "/usr/lib/python2.4/site-packages/debconf.py", line 81, in command
    status = int(status)
ValueError: invalid literal for int():

last bits of /var/log/partman:

parted_server: OUT: 1 32256-247169663999 247169631744 primary ext3 /dev/sda1

parted_server: OUT: 5 247169696256-250056737279 2887041024 logicallinux-swap /dev/sda5

parted_server: Partitions printed
parted_server: OUT:

parted_server: Closing infifo and outfifo
/lib/partman/choose_partition/60partition_tree/choices: paragraph: 1 32256-247169663999 247169631744 primary ext3 /dev/sda1
/lib/partman/choose_partition/60partition_tree/choices: paragraph: 5 247169696256-250056737279 2887041024 logical linux-swap /dev/sda5
parted_server: main_loop: iteration 137
parted_server: Opening infifo
/bin/partman: IN: QUIT
parted_server: Read command: QUIT
parted_server: Quitting

last bits of syslog:

Jun 5 05:23:00 ubuntu kbd-chooser[6967]: INFO: keymap_ask: default map: us
Jun 5 05:23:00 ubuntu kbd-chooser[6967]: INFO: keymap_ask: trans: us
Jun 5 05:23:00 ubuntu kbd-chooser[6967]: INFO: kbd_chooser: setting keymap us
Jun 5 05:23:29 ubuntu kernel: [ 255.162383] NTFS driver 2.1.25 [Flags: R/O MODULE].
Jun 5 05:23:30 ubuntu kernel: [ 255.613569] JFS: nTxBlock = 7528, nTxLock = 60224
Jun 5 05:23:30 ubuntu kernel: [ 255.999407] SGI XFS with ACLs, security attributes, realtime, large block/inode numbers, no debug enabled
Jun 5 05:23:30 ubuntu kernel: [ 255.999733] SGI XFS Quota Management subsystem
Jun 5 05:26:38 ubuntu partman: /sbin/tune2fs
Jun 5 05:26:38 ubuntu partman: :
Jun 5 05:26:38 ubuntu partman: No such file or directory
Jun 5 05:26:38 ubuntu partman:
Jun 5 05:26:38 ubuntu partman: while trying to open /dev/sda1
Jun 5 05:26:38 ubuntu partman: ^M
Jun 5 05:26:38 ubuntu partman: Couldn't find valid filesystem superblock.
Jun 5 05:26:38 ubuntu partman: mke2fs 1.38 (30-Jun-2005)
Jun 5 05:26:38 ubuntu partman: Could not stat /dev/sda1 --- No such file or directory
Jun 5 05:26:38 ubuntu partman:
Jun 5 05:26:38 ubuntu partman: The device apparently does not exist; did you specify it correctly?
Jun 5 05:40:21 ubuntu -- MARK --
Jun 5 05:46:57 ubuntu localechooser: info: Locale has been preseeded to en_CA.UTF-8
Jun 5 05:46:58 ubuntu localechooser: info: Set languagechooser/language-name = 'English'
Jun 5 05:46:58 ubuntu localechooser: info: Set countrychooser/shortlist-en = 'CA'
Jun 5 05:46:58 ubuntu localechooser: info: Set debian-installer/locale = 'en_CA.UTF-8'
Jun 5 05:46:58 ubuntu localechooser: info: Language input template is languagechooser/language-name