I have installed
ibus-m17n from Software Center. Selected and added Bengali-avro in Input method under IBus Preferences. IBus was added to the Startup Applications in power cog menu. In the Language Support, keyboard input method is set to IBus. It is seen from the top Panel of IBus-Bengali-avro and the Input Method is off. No change after pressing Ctrl+Spacebar.
Please help me to write Bengali in ubuntu 12.04.