Fedora 25 doesn't allow me to set a Compose Key
You can set it with the gnome-tweak-tool. It is found under the typing tweaks. The gnome-tweak-tool is easily installed with the gnome-software application.
You can set it with the gnome-tweak-tool. It is found under the typing tweaks. The gnome-tweak-tool is easily installed with the gnome-software application.