I found this video which seems to be exactly what I am looking for: https://www.youtube.com/watch?v=azlL8dn7ZD8
Unfortunately, the "locate" command does not seem to work in Crostini (the Chromebook terminal).
Well, guess what @sgunhouse and @leocg ... I got this to work using the video and some nuggets you fellows gave me about a week ago ... Hallelujah, my Opera on Linux/Chromebook has videos in Twitter and elsewhere now! 🙂