- In the OS settings, go to "keyboard" and select a "Compose Key." I like to use "Print Screen"
- Edit (or create) ~/.XCompose to include the following:
# Capital Letters
<Multi_key> <G> : "Γ" U0393 # GAMMA
<Multi_key> <D> : "Δ" U0394 # DELTA
<Multi_key> <L> : "Λ" U039B # LAMDA
<Multi_key> <P> : "Π" U03A0 # PI