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The software center application replaced a similar one called add/remove software that is present in every gnome based distro I have ever tried, so its not really fair to call it an advantage of Ubuntu specifically. It is clearly not fair to say the repository system is a unique advantage of Ubuntu versus other distros.

You could say that the launchpad bug reporting/management system is a unique advantage though. MS and Apple probably do have something similar, but it is tainted (from a user perspective) by the profit motive of those companies, and users don't get to participate in diagnosing or trying to patch their own systems.