In Lubuntu 15.10 even though in /etc/default/keyboard it is set that XKBOPTIONS="compose:rctrl", no compose key works when using Right Ctrl. The system doesn't even register it as compose key (any letter I type after pressing it is printed on screen, it doesn't wait for a combination).
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2 Answers
I don't know if this applies to Lubuntu, but here's the solution for regular Ubuntu:
/etc/default/keyboard doesn't seem to matter. It doesn't have XKBOPTIONS filled in on my system even though I have the compose key enabled. What does matter is the gconf setting 'org.gnome.desktop.input-sources xkb-options'. You can edit it via dconf or use terminal like so:
Check the current value:
gsettings get org.gnome.desktop.input-sources xkb-options
If the above just returned empty brackets, run this, and you're done:
gsettings set org.gnome.desktop.input-sources xkb-options "['compose:rctrl']"
Keyboard Layout Handler seems to override the system settings, so this is how you solve the problem:
- Right-click on the language flag in the bottom right.
- Select "'Keyboard Layout Handler Settings' Settings".
- Under "Advanced setxkbmap Options" input
compose:rctrland click on the little "save" button in the right end of the input box.