install the latest nginx

You can get the latest stable version of Nginx from the Nginx PPA on Launchpad:
You will need to have root privileges to perform the following commands.

sudo su -
echo "deb http://ppa.launchpad.net/nginx/stable/ubuntu lucid main" >> /etc/apt/sources.list
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys C300EE8C
apt-get update 
apt-get install nginx

Source: nginx wiki