Comment 3 for bug 446476

Sorry for the mistake. ibus-anthy is indeed installed. However, a Japanese input method is not immediately available.
Launchpad is throwing an error when I attempt to edit the bug description, so I'll provide an updated description here:

As of Karmic, gnome-language-selector no longer installs a readily usable IME when adding Japanese language support.

When I installed Japanese support, ibus was not configured with a Japanese input method. Post-install, I had to manually add one.

In previous versions of Ubuntu when language-selector installs scim-anthy, a Japanese input method is automatically configured. The switch to ibus-anthy has introduced an extra step in configuration of a Japanese input method.