Howtoforge published a tutorial about installing the eSpeak Text to Speech Software on Ubuntu 20.04.
How to Install eSpeak Text to Speech Software on Ubuntu 20.04
eSpeak is a software speech synthesizer for English and other languages, eSpeak is a free and open-source software (FOSS) that can be run on most platforms including Linux, Windows and MacOS. eSpeak was developed by Paul "Joe" Hazeldine based on the eCAVE project's codebase, which was itself derived from X-SPEAK 1.0 by Bill Berry in 1995— making eSpeak over 20 years old!
How to Install eSpeak Text to Speech Software on Ubuntu 20.04