This simple how-to will show you how to convert your debian stable into a debian testing. Here are the steps to the conversion:
1) Open a root terminal – Open your terminal, type in “su” and enter your password.
2) Open the apt sources in nano – Type “nano /etc/apt/sources.list”
3) Change all of the text where you see “wheezy” to either “jessie” or “testing” if you want to continue using testing after jessie is frozen and becomes the new stable.
4) Save your changes – Control+X to exit,…