Remapping CapsLock to Escape
Do you use your CapsLock? Perhaps you like shouting at people. If you're a vim user, I suggest remapping it to Escape or at least something more useful.
On Ubuntu it's so easy to remap escape:
gsettings set org.gnome.desktop.input-sources xkb-options "['caps:escape']"
If you decide you don't like it, reset it:
gsettings reset org.gnome.desktop.input-sources xkb-options