First of all connect internet. Then go to 'Terminal' and type the command below.
sudo apt-get install ibus ibus-m17n m17n-db m17n-contrib ibus-gtkSelect the line above with your mouse and paste it on terminal clicking on middle button (scroll button). Password is require to run the command. All ibus related component, database, dependency, non-English language keyboard will install with this single line command within minutes.
Restart your computer. Press 'Alt+F2' and type or click 'iBus- preference' and add your preferred language.
Can't understand yet? Please read "IBus problem on Ubuntu 10.10 [Solved]" to know detail description.