How do I remap the Caps Lock and Ctrl keys?

13.10+:

Install and use gnome-tweak-tool > Keyboard & Mouse > Keyboard > Additional Layout Options > Caps Lock behavior.

Pre 13.10:

Open the Keyboard Preferences dialog (System -> Preferences -> Keyboard). On the layout tab, click the Options... button. Expand the Ctrl key position section and select Swap Ctrl and Caps Lock.

Those settings should be applied each time you log in, and will only affect your user account.

Here's a way to do it without installing extra software:

setxkbmap -layout us -option ctrl:nocaps

Source:

• http://www.noah.org/wiki/CapsLock_Remap_Howto

One of the best ways to do that graphically if you are using the GNOME shell is to install Gnome Tweak Tool:

sudo apt-get install gnome-tweak-tool

For version 3.30.0 and later:

• Open tweak-tool and click on the Keyboard & Mouse section in the left menu bar.
• Click on the Additional Layout Options button on the left.
• Under Caps Lock behavior select Caps Lock is also a Ctrl.

For older versions:

• Open tweak-tool and click on the typing section in the left column.
• You should now see the line Caps Lock key behavior on the left.
• Choose Make Caps Lock an additional Ctrl key instead of Disabled in the drop-down list and you should be good.

Enjoy your new Ctrl key!