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Cloning a Debian system - identical packages and versions

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http://www.debian-administration.org – I have long wished for the ability to install a Debian system specifying both the package list and the exact versions of the packages installed. dpkg --get-selections | ssh newhost dpkg --set-selections is useful but always chooses the latest version, and especially when using testing or unstable, it is sometimes necessary to temporarily downgrade a package from the latest version available. (Distributions)