HOW TO ADD THE GREEK ALPHABET TO YOUR KEYBOARD
Here are some links to easily convert your keyboard
We have found these easy to install and simple to use. If you have any other links please share them with the community.
This link has good pronunciation of the Alphabet:
AND the Forums: >https://www.duolingo.com/topic/936
For LINUX see comment by macherb16 below.
For Linux (debian) I use "setxkbmap gr". I use fluxbox as windowmanager. To switch between us and gr I added the following lines to ~/.fluxbox/keys:
F12 :execCommand setxkbmap gr
Shift F12 :execCommand setxkbmap us