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Re:Regarding the Em Dash by Freak_NL on Sunday January 07, 2018 @05:34AM (#16090270)
> There will be a dialog somewhere too.

In Ubuntu Unity and — I think — Gnome Shell:

Keyboard settings » Shortcuts » Typing » Compose key

Re:Regarding the Em Dash by BenjiWiebe on Sunday January 07, 2018 @02:53PM (#16092322)
And KDE, IIRC: system settings, input settings, keyboard, advanced, compose key.