Thanks for sharing this experience. I too have been unable to get speech-dispatcher to work despite trying on multiple previous versions of Calibre. These days I'm using a Calibre 7.1 via flatpak on Ubuntu 20.04 and don't believe there is a way to install speech-dispatcher given the sandboxed nature of flatpak. The only ppa I found for Calibre on Ubuntu ( 20.04 & 22.04 ) seems to have Calibre 5.11.
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