Click the + icon, search for "Bengali (Avro Phonetic)" , and click Add .
Go to System Settings -> Keyboard -> Text Entry . avro keyboard for ubuntu 16.04 download
Use the shortcut (usually Super + Space or Ctrl + Space ) to toggle between English and Bengali while typing. Key Features for Ubuntu Users Phonetic Typing: Type "ami" to get "আমি". Click the + icon, search for "Bengali (Avro