You will have to employ this command for all users but after that it will be run and set upon each login. I can't put it in a code box because there are quoted returns in the command that the code box sees as an end. But will be read quite differently by BASH. Copy and paste the following in a terminal and press enter. Do this for each user. It could be incorporates into an install script as well but you will need someone more experienced with making a script run for each user. Copy and paste the whole thing, from echo to the last autostart blank lines and all, one big copy and paste.
xset s 0 0
xset s off
exit 0' > screensave_off.sh ; chmod +x screensave_off.sh ; echo '[Desktop Entry]
Exec= sh ~/screensave_off.sh
Comment=to turn off the Xserver power save' > Screen-Saver-Off.desktop ; chmod +x Screen-Saver-Off.desktop ; mv Screen-Saver-Off.desktop ~/.config/autostart