Comment by remote-dev

I do—commented on another thread, but:

  On Linux (maybe only certain distros, not sure) the keys are different, 
  but you can enable a Compose key and enable special character keybinds as well.
  
  For example on Mint:
    en–dash is "<compose> <minus> <minus> <period>"
    em—dash is "<compose> <minus> <minus> <minus>"