Having GSM Internet connection and multiple Debian based PC in your local network is not every users dream situation. That's especially true if your mobile broadband service provider limits amount of data you can transfer per month for reasonable price, and everything above limit is very expensive. Besides that having flat rate Internet connection and hundred PC inside your LAN could potentially create unnecessary network congestions. Wouldn't it be nice to have some kind of apt caching proxy so we could download apt packages and updates only one time, and then distribute them inside our LAN to all of our Ubuntu or Debian PCs? Author of Apt-Cacher NG apt caching proxy came to rescue with its useful but somewhat hard to setup application. I will explain how to get things moving in 10 minutes max...