Typing Chinese (Cangjie) in Ubuntu 16.04

1. In "Language Support", make sure "IBus" is selected for Keyboard input method system.
2. Install / Remove Languages, add "traditional Chinese"
3. # sudo apt install ibus-table-cangjie3
4. Log Out/Log In (Important, or else below cangjie3 won't show up)
5. In "Text Entry", click "+" to add Input sources (Chinese (cangjie3)
6. Change "Switch to next source using:" to e.g Ctrl+Space

Then you can type cangjie!