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.
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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.