Comment 1 for bug 1683898

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Gunnar Hjalmarsson (gunnarhj) wrote : Re: Compose key section needs to be updated

Please note that the Ubuntu Desktop Guide, i.e.

https://help.ubuntu.com/stable/ubuntu-help/tips-specialchars.html#compose

is not intended to reflect Ubuntu GNOME 17.04, but only Ubuntu 17.04 (with Unity). OTOH, neither GNOME Help seems to accurately reflect Ubuntu GNOME 17.04 in this respect; changing the affected packages of this bug.

As you say, the GUI option to set a compose key seems to be gone in Ubuntu GNOME 17.04. Can't tell if it's a bad design decision or if there is some other GUI way which is not (yet) documented. Anyway, you can set it with a terminal command.

To make <RightCtrl> the compose key, run:

gsettings set org.gnome.desktop.input-sources xkb-options "['compose:rctrl']"

To see which other keys are possible to use, enter the terminal command:

man xkeyboard-config

and scroll down to the section "Position of Compose key".