Binary package “upgrade-system” in ubuntu intrepid

system upgrader from Konflux

 Upgrade-system offers a convenient way to keep a Debian system up-to-date,
 yet free from accumulated cruft such as obsolete libraries.
 It is particularly useful on systems that mix packages from different
 releases (stable/testing/unstable) and on desktop systems where packages
 are frequently installed or removed according to evolving user tastes.