wget http//nginx.org/keys/nginx_signing.key
2. Add him
apt key add nginx_signing.key
3. Adding next text in file repository /etc/apt/sources.list:
echo "deb http://nginx.org/packages/debian/ squeeze nginx">>/etc/apt/sources.list
echo "deb-src http://nginx.org/packages/debian/ squeeze nginx">>/etc/apt/sources.list
4. Updating:
apt-get update
apt-get upgrade
5. Check the version:
nginx -V