I have been using Anthy on Ubuntu for quite some time, and I think that it has worked perfectly up until 9.4. I didn’t have time to explore that release so much, but I noticed now that in 10.04 the Japanese input does not work out of the box.
First thing first; install language support if you haven’t done that. (System->Administration->Language Support-> Install)

Install Anthy if you haven’t done so:
sudo apt-get install scim scim-anthy anthy kasumi scim-tables-jasudo apt-get install ibus ibus-anthy ibus-gtk ibus-qt4
Next, add Japanese input through the IBus. (System->Preferences->IBus Preferences-> Input Method tab)
Now, we can type in 日本語 again! The familiar panel in the lower right corner will appear if you touch the 半角/全角-button. Note that it will not appear if you are not in a text-input area.
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January 18th, 2010 at 11:15 pm
I noticed that the IBus doesn’t start automagically when starting a new session.
Fix from ubuntuforums:
PROBLEM: IBus doesn’t start automatically when I restart my computer
Here is how I solved the problem:
Go to the menu:
System >> Preferences >> Startup Applications
Click the button: Add
Name: IBus daemon
Command: /usr/bin/ibus-daemon -d
Comment: start IBus daemon when Gnome starts
May 10th, 2010 at 7:47 pm
日本語で書けるようになった!
June 6th, 2010 at 11:03 am
Coool! Thank you very much! どうもありがとう!
June 7th, 2010 at 1:33 am
いいえ、 no problem!
July 13th, 2010 at 7:38 pm
ありがとう
August 17th, 2010 at 5:05 am
どうもありがとう!