Install mbrola-de1 by entering the following commands in the terminal:
sudo apt update sudo apt install mbrola-de1
Description:
German female voice for Mbrola
This package contains a German diphone database provided in the context of the MBROLA project see: http://tcts.fpms.ac.be/synthesis/ . It provides a German female voice to be used with the MBROLA program.
Homepage: http://tcts.fpms.ac.be/synthesis/
Version: 2.050+repack-3
Section: multiverse/sound