• System Environment:
    • fedora x86_64 Linux 4.15.14-300.fc27.x86_64 (Workstation Edition)

  • Desktop Environment:

    • KDE 5.44.0 / Plasma 5.12.4 (Installed using the "groupinstall" command)

Steps:

  1. Install kcm-fcitx
  2. Install other components of fcitx according to your needs. (For example, install Anthy to support Japanese input.)
  3. Executing "im-chooser" in the terminal and select fcitx
  4. Log out and log in again.

That's enough.