I'm on Ubuntu trusty, and I use greek letters for algebra. I'd love to be able to type them in quickly with AltGr–letterKey.
For example, map alpha to AltGr–A, map beta to AltGr–B, map theta to AltGr–T, etc.
This page explains how to do it on an earlier version of Ubuntu. When I try following it, I can go to System Settings -> Keyboard -> Typing -> Compose Key.
But when I get to Compose Key, it says that it's 'disabled'. Nothing happens when I click the row and hold down new keys, nor when I press backspace to clear. Even if it did work, I don't see how that would enable to me to re-assign AltGr–[A..Z].
Can anyone help?