Does Ubuntu 20.04 Focal Fossa support the Compose-Key?

Solution 1:

Gunnar's comment pointed me into the right direction.

gsettings get org.gnome.desktop.input-sources shows the current active settings and therefore I was able to find out that I used the wrong key.

Using the gnome-tweak-tools I could update the settings accordingly to the right-ctrl which finally worked.

Thanks to the previous answers, here is the method that worked for me:

List keyboard settings:

gsettings list-recursively org.gnome.desktop.input-sources

Set the compose key:

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

List possible values for compose key:

grep "compose:" /usr/share/X11/xkb/rules/base.lst