The Unity indicator-lockkeys

indicator-lockkeys is just another indicator for Lock Keys with fancy icons, which allows you enabling and disabling Caps Lock and Num Lock directly from the Graphical User Interface.

Installation

Use the following ppa:

sudo add-apt-repository ppa:l3on/indicator-lockkeys
sudo apt-get update
sudo apt-get install indicator-lockkeyssudo add-apt-repository ppa:l3on/indicator-lockkeys
sudo apt-get update
sudo apt-get install indicator-lockkeys

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

Manually

Checkout the git repository:

git clone https://github.com/LeoIannacone/indicator-lockkeygit clone https://github.com/LeoIannacone/indicator-lockkeys

Install the deps:

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

Build and install system wide:

cd indicator-lockkeys
make
sudo make install
cd indicator-lockkeys
make
sudo make instal

Fuente: http://en.leoiannacone.com/2015/06/the-unity-indicator-lockkeys/