installer: partman_auto.py: need more than 1 value to unpack

Binary package hint: ubiquity

kubunut 7.04 beta installer Step4 of 6:

Mar 25 00:44:09 ubiquity: Setting keyboard layout: pc105 de nodeadkeys []

QSocketNotifier: Invalid socket 17 and type 'Read', disabling...
QSocketNotifier: Invalid socket 17 and type 'Read', disabling...
QSocketNotifier: Invalid socket 17 and type 'Exception', disabling...
Mar 25 00:44:14 ubiquity: Starting up '['log-output', '-t', 'ubiquity', '--pass-stdout', '/bin/partman']' for ubiquity.components.partman.Partman

Mar 25 00:44:14 ubiquity: Watching for question patterns ^partman-auto/.*automatically_partition$, ^partman-auto/select_disk$, ^partman-partitioning/new_size$, ^partman/choose_partition$, ^partman/confirm.*, type:boolean, ERROR, PROGRESS, ^partman/confirm
_new_label$, ^partman/free_space$, ^partman/active_partition$, ^partman-partitioning/new_partition_(size|type|place)$, ^partman-partitioning/confirm_resize$, ^partman-partitioning/new_size$, ^partman-target/choose_method$, ^partman-basicfilesystems/(fat_m
ountpoint|mountpoint|mountpoint_manual)$, ^partman/exception_handler$, ^partman/exception_handler_note$

Mar 25 00:44:15 ubiquity: Partman: update_partitions = None
Mar 25 00:44:15 ubiquity: Partman: update_partitions = None
Mar 25 00:44:15 ubiquity: Partman: update_partitions = None
Mar 25 00:44:15 ubiquity: Partman: update_partitions = None
Mar 25 00:44:15 ubiquity: Partman: update_partitions = None
Mar 25 00:44:16 ubiquity: Partman: update_partitions = None
Mar 25 00:44:16 ubiquity: Partman: update_partitions = None
Mar 25 00:44:16 ubiquity: Partman: update_partitions = None

Mar 25 00:44:16 ubiquity: Partman: update_partitions = None
Mar 25 00:44:16 ubiquity: Partman: update_partitions = None
Mar 25 00:44:16 ubiquity: Partman: update_partitions = None
Mar 25 00:44:17 ubiquity: Partman: update_partitions = None
Mar 25 00:44:17 ubiquity: Partman: update_partitions = None
Mar 25 00:44:17 ubiquity: Partman: update_partitions = None
Mar 25 00:44:17 ubiquity: Partman: update_partitions = None
Mar 25 00:44:17 ubiquity: Partman: update_partitions = None
Mar 25 00:44:17 ubiquity: Partman: update_partitions = None
Mar 25 00:44:18 ubiquity: Partman: update_partitions = None
Mar 25 00:44:18 ubiquity: Partman: state = [['', None, None]]
Exception in KDE frontend (invoking crash handler):
Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde-ui.py", line 1339, 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 268, in process_line
    widget.subst(question, key, value)
  File "/usr/lib/ubiquity/ubiquity/components/partman.py", line 228, in subst
    PartmanAuto.subst(self, question, key, value)
  File "/usr/lib/ubiquity/ubiquit
y/components/partman_auto.py", line 99, in subst
    self.resize_min_size = self.parse_size(value)
  File "/usr/lib/ubiquity/ubiquity/components/partman_auto.py", line 81, in parse_size
    (size_int, size_frac) = num.split('.', 1)
ValueError: need more t
han 1 value to unpack

before it did work on the same machine, but the installation crashed later.
fdisk -l

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot Start End Blocks Id System
/dev/sda1 1 2432 19535008+ 83 Linux
/dev/sda2 2433 19457 136753312+ 5 Extended
/dev/sda5 2433 3648 9767488+ 83 Linux
/dev/sda6 3649 6080 19535008+ 83 Linux
/dev/sda7 6081 15806 78124063+ 83 Linux
/dev/sda8 15807 16049 1951866 82 Linux swap / Solaris
/dev/sda9 16050 16657 4883728+ 83 Linux
/dev/sda10 16658 17265 4883728+ 83 Linux
/dev/sda11 17266 17873 4883728+ 83 Linux
/dev/sda12 17874 19457 12723448+ 83 Linux

sda12 is a dmcrypt-partition