Seems like you need to install additional components: https://askubuntu.com/questions/761975/chromium-is-not-generating-voice https://askubuntu.com/questions/76

Seems like you need to install additional components: https://askubuntu.com/questions/761975/chromium-is-not-generating-voice https://askubuntu.com/questions/761975/chromium-is-not-gener... Question/answers from 2016, so might be misleading...