This version only includes Caps Lock indicator as Num Lock is useless on my laptop

This is just another indicator for Lock Keys with fancy icons which can enable and disable Caps Lock directly from the Graphical User Interface.

Manually

Install the deps:

sudo apt-get install valac libgtk-3-dev libappindicator3-dev libcaribou-dev libgtk-3-bin

Build and install system wide:

make
sudo make install

Then exec indicator-lockkeys from command-line or logout and login in Unity again.