Problem: That progress bar shows no progress. I checked task usage of CPU, and CPU usage of Brasero is negligible. Even after many minutes, nothing seems to happen. What am I not doing that I should do, and/or doing that I should not do?
Sorry, I don't have a solution for you but thought I would mention that apparently Brasero has been unmaintained for some time and a new maintainer recently took it over so there may be a fix in future versions, but of course that doesn't help you right now.
You'll end up having to install a bunch of kde libs but try k3b.