Right-CTRL key not supported in Kubuntu 14.04?

I had the same problem with Ubuntu 14.04, using the "French (alternative)" layout (which probably stands for "Français (variante)". The issue seems to originate from a bug in xkb.

I could solve it without changing the layout and without remapping keys.

Follow these steps:

• Open /usr/share/X11/xkb/symbols/fr as administrator.
• Find the line include "level5(rctrl_switch)" and remove it or comment it out. (Commenting out is done by adding // at the beginning of the line.)
• Save the changes
• Delete all the .xkm files in /var/lib/xkb (or move them to another folder). This will force to rebuild xkb.
• Reboot.

This blog post (in French), addresses the problem and points to this bug entry which helped me figure out the solution.

I hope it will help a lot of French *ubuntu users.

With Unity on Ubuntu 14.04, I managed to have a fully working right control key using keyboard "Français" instead of "Français (variante)", using the keyboard icon on top right of the screen.

"Français (variante)" is the default selected during installation...

I don't know how to apply that on Kubuntu, sorry !