iBus-Mozc: New Input Method for Japanese
Google Japan recently announced on its blog that the Japanese Input Method, which has been in development since last December, is officially out of beta. There is actually an open-source version of this input method called Mozc.
Install iBus-Mozc in ubuntu using PPA
Open the terminal and run the following commands
sudo add-apt-repository ppa:japaneseteam/ppa
sudo apt-get update
sudo apt-get install ibus ibus-mozc ibus-gtk
Once you restart, you should then see in the applet menu the keyboard icon. Under the setting, you can add Japanese > Mozc to enable the input method.