Timezone combo doesn't always change (doesn't retranslate) if I change language

i want change value default timezone in ubiquity of kubuntu 9.10 then do how
Example : change United Stated/Eastern to Asia/Vietnam time
Thanks

Merged, thanks!

This bug was fixed in the package ubiquity - 2.1.12

---------------
ubiquity (2.1.12) lucid; urgency=low

  [ Colin Watson ]
  * Add osextras.unlink_force, equivalent to 'rm -f', to save on tedious
    exception handling.
  * Only restart debconf-communicator when changing language, not every time
    we switch page. This speeds up page transitions quite a bit, and should
    incidentally fix LP: #508725 as well.
  * GTK frontend:
    - Check plugin builders as well when adding widgets (setting their
      names, making them callable by the toplevel, etc.). This fixes
      translations of the language, timezone, and keyboard pages.
  * Fix immediate retranslation when changing language.
  * Add a semaphore to misc.regain_privileges and misc.drop_privileges, so
    that a drop/regain pair always returns to the previous state.
    misc.drop_all_privileges is now more clearly one-way, enforced by an
    assertion.
  * Add a context manager (raised_privileges) and a function decorator
    (raise_privileges) that are equivalent to a
    regain_privileges/drop_privileges pair, but that wrap up the required
    try/finally logic to make it less likely that we'll end up at the wrong
    privilege level by mistake.
  * When attempting to upgrade the installer, only stop debconf-communicator
    once we've determined that we actually have something to upgrade
    (LP: #495175).
  * Require Python 2.6, for the 'with' statement.
  * Move default GRUB target calculation to ubiquity.misc, which is a better
    location for common code than ubiquity.components.summary. Try to avoid
    using (hd0) as the target (prefer the first device from grub-mkdevicemap
    output if possible), and, when installing from a non-CD medium, only
    reset the default boot device if we would otherwise end up installing
    GRUB to the installation medium.
  * Initialise FilteredCommand.ui_loop_level earlier, just in case
    (LP: #484452).

  [ Evan Dandrea ]
  * Allow the user to set a hostname in oem-config.
  * Finally, finally, finally successfully work around GTK+ not
    supporting height-for-width in labels.
  * Remove labels created by plugins from the focus chain.
  * Don't try to generate an apparmor cache in oem-config.
  * Slightly better exception printing in scripts/install.py
  * GNOME Bug #56070 (can't click button twice) has long since been
    closed. Remove hack.
  * Automatic update of included source packages: localechooser
    2.12ubuntu3, user-setup 1.28ubuntu3.

  [ Mario Limonciello ]
  * Drop old hack for reconfiguring mythbuntu-default-settings since
    this is fixed in user-setup now.
  * Drop old hack for copying ^xserver-xorg onto the target system. No
    longer necessary as thse variables don't exist in current installs.

  [ Dylan McCall ]
  * Use slideshow for language variants if available (LP: #476269).

  [ Michael Terry ]
  * Reset contents of timezone combo boxes every time the timezone page is
    entered (LP: #461104).
 -- Evan Dandrea <email address hidden> Wed, 20 Jan 2010 15:35:08 +0000