so there is a program on linux that can make you pc talk using the command line called festival

you need to install it so:

control+alt+t

apt-get install festival

the copy and past this fallowing code:

printf ";use ALSA\n(Parameter.set 'Audio_Method 'Audio_Command)\n(Parameter.set 'Audio_Command \"aplay -q -c 1 -t raw -f s16 -r \$SR \$FILE\")\n" > .festivalrc

open your command line again and write this

festival
(SayText "Hello")

press control+D to come back to you command line

you can also use this but true the command line= no need to write festival first

echo "hello"|festival --tts