Install festvox-en1 by entering the following commands in the terminal:
sudo apt update sudo apt install festvox-en1
Description:
mbrola-en1 voice support for festival
This package lets festival make use of the non-free mbrola-en1 sample-based voice instead of its own synthesis voices.
Homepage: http://www.cstr.ed.ac.uk/downloads/festival/1.95/festival-1.95-beta.tar.gz
Version: 1.95-1
Section: multiverse/sound