ibus is not working in elementary OS Loki though installed and setup as required. Even if the the input changed from English to Avro (a Bengali ibus input) except few applications(Eg. Plume Creator), most of the application is not supporting writing with Avro, instead it is continuing writing in English.
ibus Avro setup instruction https://github.com/sarim/ibus-avro/blob/master/README.md