Trying to turn the capslock into a control as I have big hands and will end up with RSI 
Tried:
setxkbmap -option ctrl:nocaps
Doesn’t work.
Also compiled and installed interception tools & dual function keys and configured, doesn’t work.
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Best way I found is to edit the keycodes via a config file:
sudo nano /usr/share/X11/xkb/keycodes/evdev
Do a search in the doc for the keys you hope to switch. I used this to swap CTRL/ALT. I would recommend noting out anything you change.
What I’m still hoping to figure out: How to add different keyboard types. I’d like to switch the keyboard to U.S. (Macintosh) so I have easy access to command keys via the third level (which comes in handy for things like curly quotes and long dashes).
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Tried, but couldn’t get it working, changed:
<CAPS> = 66;
# To:
<LCTL> = 66;
It doesn’t have the desired effect, it does kill the caps lock though.
Hmm. Interesting. Does it work if you swap other keys? I’m wondering if it’s a Caps Lock only thing.
Probably, what did you do?
I was able to swap LCTL and LALT via this config file. That said I was thinking about putting Meta or Super on Caps Lock to allow the Super key to go third level.
If I wasn’t using emacs, I could see the advantage in that. I have an idea, what if I tried <CAPS> = <LCTL> ???
Nope, kills the jingpad 
Thankfully ssh still works, so I ssh’d in and undid the edit
Move fast, break things 
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your information is interesting i am agree and but i am not idea.
This thread is quite helpful.
I fixed this for myself using keymapper.
You can find my setup script at the following location:
Unfortunately it doesn’t always survive a sleep /wake cycle. So executing the following in a terminal will reactivate the override.
key-mapper-control --command autoload --config-dir $HOME/.config/key-mapperI did the same thing, and it worked very well. Be sure to reboot your system when you modify /usr/share/X11/xkb/keycodes/evdev file.