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How to enable testing and unstable repository on Debian

The testing and unstable repositories of Debian provide with a higher version of software applications than what is present in the stable repository. Note that these names are actually aliases such that the stable repository points to the current Debian stable release and the Testing repository is what is going to be part of the next Debian stable release. So at the time of this post, Wheezy 7.x is the Stable release and Jessie is the Testing source which is going to be the next stable release.