PCLinuxOS
PCLinuxOS maintains its own software repository, available via the Advanced Packaging Tool (APT) and its Synaptic front-end, completely replacing Mandriva's urpmi. PCLinuxOS endeavors to maintain a fully valid upgrade path for version 1.0. This means that an installation could be continuously updated to the latest versions of packages, hence foregoing the need to re-install the entire distribution upon each successive release.  In the test releases before 1.0, it has sometimes been necessary to perform a reinstallation.