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I have only a quick question. Does Kubuntu, Xubuntu and others has the same level of security like the plain Ubuntu? I mean security for the desktop environment, because I know that for others it has, because it is based on Ubuntu. And also, do I need to worry about it, as I am not an advanced user? (not beginner, but I'm not extremely good at IT as others :D ) Thank you for your answer!

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Security is the same across all supported derivatives of Ubuntu (Kubuntu, Xubuntu, Lubuntu, etc.).

See also:

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Thank you very much! – user146535 May 14 '13 at 13:41
A more detailed response would be that the derivatives use the same Ubuntu repositories than Ubuntu itself. e.g. Kubuntu uses main, universe, restricted and multiverse. So all updates to the repositories will be available to the derivatives. – seb Oct 14 at 8:53

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