You should replace Caps Lock key for the following reasons.

• 1.Caps Lock key easy to push from home position.
• 2.Nowadays, We need few time to use Caps Lock.
• 3.if Push ESC key from home position, you will use vim more usefull.

Lets try.

1.get gnome-tweak-tool

sudo apt install gnome-tweak-tool

2.start gnome-tweak-tool.

Select "Caps Lock behavior" with "Make Caps Lock an additional ESC"

3.Restart ubuntu.

The setup procedure is over.
Now, your Caps Lock key is ESC.

thanks reading my post.