I searched the forums and saw a request for OpenVAS back in the BT3 days (remember them as they were yesterday).
Any reason it is not on the beta ?
IIRC pure_hate said it might be included in the final version of BT4.
Besides that, theprez98 gave you the perfect answer
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I'm not sure why it didnt make it, I thought it was going to. I have it going in gentoo perfectly and there a ubuntu/debian instructions on the site.