I have the ASUS USB-BT500 and it officially supports linux and works very well. Buy that

Bazzite or nobara. Bazzite just works, nobara is a bit more flexible with what you can install easily

It is good for answering simple questions. It isn’t a search engine its more of an answers engine wherby you ask something and it will do the search and procure the answer from the results. It works well most of the time however like all AI it hulicinates so if you ask it something too complex it isnt very good.