gnome-language-selector crashed with SystemError in markInstall()

[ev]

Binary package hint: language-selector

1.
>System > Admin > Language Support opens up with a message:
"The language support is not installed completely
Some translations or writing aids available for your chosen languages are not installed yet. Do you want to install them now?"

2.
After clicking install:
"Could not apply changes!
Fix broken packages first."

3.a.
after invoking install:
Adding languages, apply changes button stays gray
-or-
3.b.
after invoking install:
Removing languages, apply changes button works, but when clicked the app. crashes.

NB. Installed languages and related keyboard layouts seem to work fine.

Ubuntu lucid (development branch)
Upgraded from 9.10 thru update/upgrade tool

ProblemType: Crash
Architecture: amd64
Date: Tue Mar 23 21:07:01 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/bin/gnome-language-selector
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
InterpreterPath: /usr/bin/python2.6
NonfreeKernelModules: h826d
Package: language-selector 0.5.2
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/gnome-language-selector
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
PythonArgs: ['/usr/bin/gnome-language-selector']
SourcePackage: language-selector
Title: gnome-language-selector crashed with SystemError in markInstall()
Uname: Linux 2.6.32-16-generic x86_64
UserGroups: adm admin audio cdrom dialout dip fax fuse lpadmin mythtv netdev plugdev root sambashare tape video

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #331380, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.