Cannot install Japanese on Language Support Ubuntu 12.04

Is this a bug???? I'm posting first and am planning to report if I don't get an answer.

My computer: ASUS U31SG-AS31
Ubuntu version: 12.04

Problem:

I would like to type in Japanese (phonetically, so typing "o-ha-yo" will produce those letters). My IBus keyboard icon, when clicked, does not show any language other than Chines when I click on Preferences -->Input Method tab. All tutorials have a Japanese option with the Japanese-Athy selection. I thought maybe it was because Japanese was not installed in the Language Support.

I cannot install the Japanese language under Language Support. I can install other languages. This is what happens:
I click on the "Language" tab, then click on "Install/Remove Languages", select Japanese, click to check the box and click "Apply Changes".

I get an error box (titled gnome-language-selector) saying "Failed to download package files" with the Details: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/f/firefox/firefox-locale-ja_13.0+build1-0ubuntu0.12.04.1_amd64.deb 404 Not Found [IP: 91.189.92.166 80]

Is this a kernel related bug?? Or something completely different? I've searched various forums and haven't come across any similar problems....please advise!!!!