Keryx provides a way to download software and updates for Ubuntu systems that have little or no connectivity to the Internet. Simply put Keryx on your pen drive, use it to create a new project file (
which retains a copy of your software sources and other system details), then take the pen drive to a computer with a better connection. Via its Synaptic-like interface, users can then select all updates for download, plus select any other software they may want to install, complete with dependency resolution.
The most interesting part of Keryx is that you can install or upgrade the package for your Ubuntu or Debian system from another Linux or Windows system which got better Internet connection.
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source:http://linuxpoison.blogspot.com/2010/11/13578167759260.html