xev in an console and print the Caps Lock. It will print some events, find a line like:
state 0x4, keycode 66 (keysym 0xffe3, ...
The keycode for the Caps Lock is 66.
Then, set the mapping of the Caps Lock with
xmodmap to map Caps Lock to left Control:
xmodmap -e "keycode 66 = Control_L"
Last, if you want to save the changes permanently, you may consider add the config into your
You can run xmodmap on this map:
clear control clear Lock keycode 66 = Control_L add control = Control_R Control_L