I personally hate the idea of writing Bangla in English spelling. And its ambiguous also. You can enable the probhat from the System>Preferences>SCIM Input Method Setup
You can also set keyboard shortcut for switching keyboard layouts. Thanks. ps. The method of setting up probhat is described in older posts in this site also. plz search in www.ubuntu-bd.org -- ubuntu-bd mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bd
