I installed MAAS server, would like to add one node with a differnet ubuntu release, how should I do it?

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http://askubuntu.com – I looked around, it seems lots of information, is there a step by step instruction somewhere? I tried to add a VM-node manually,it is in commissioning state, what should I prepare before starting using juju? Everywhere the example is with 10.x.x.x, guess that ip address should be based on my own network. Any help would be appreciated. (HowTos)