$ echo "deb http://ppa.launchpad.net/nginx/$nginx/ubuntu lucid main" > /etc/apt/sources.list.d/nginx-$nginx-lucid.list
$ apt-key adv --keyserver keyserver.ubuntu.com --recv-keys C300EE8C
$ apt-get update
At this step you might get an error in upgrading
"W: GPG error: http://nginx.org lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ABF5BD827BD9BF62"
So try this
$ wget http://nginx.org/packages/keys/nginx_signing.key
$ cat nginx_signing.key | sudo apt-key add -
OK
$ apt-get update
Now Install
$apt-get install nginx
$/usr/sbin/nginx -V
