Remap a Modified Key

Question

How can I remap a modified key such as CTRL-j to another key (possibly modified), while leaving the key j alone?

I am using Ubuntu 18.04.

Answer 1

On ubuntu, keyboard shortcuts can be managed through 'Settings Editor' and 'Keyboard'. These programs can be respectively installed by

sudo apt install xfce4-settings-editor

sudo apt install xfce4-keyboard-settings

In xfce4-keyboard-settings (the simpler program), go to the 'Application Shortcuts' tab and double-click on the shortcut that you want to edit, presumably Ctrl+J, then edit the shortcut.

Answer 2

You can use the remapper deamon keyd for this purpose. See this answer for installation, usage and tips.

After installation, use the config below. It makes left control activate a layer controlj while held, where every thing you press is be default modified by control (the :C), except for the key(s) remapped in the layer---in this case only j, which is remapped to Shift + j.

You can throw other modifiers on there, e.g. j = M-A-C-S-j for Meta + Alt + Control + Shift + j.

[ids]



[main]
leftcontrol = layer(controlj)
[controlj:C]
j = S-j