Install Caffeine in Ubuntu 11.04

sudo add-apt-repository ppa:caffeine-developers/ppa

sudo apt-get update && sudo apt-get install caffeine

Refer

• http://askubuntu.com/questions/35445/is-there-an-inhibit-sleep-indicator-for-unity
• http://www.techdrivein.com/2011/05/10-useful-application-indicators-for.html