I've installed both ettercap and sslstrip using the links in the first post. After that, I installed Yamas using the package in extras. When I launch it, after setting all to default (ports, etc.), I get a warning stating that "cannot convert "nil12" to type FontStruct". I am more than a noob. I have no idea what it means as I don't know what is "nil12". I checked with yamas -d, and all dependencies are OK.

By the way, I tried to attack my laptop connected to my private wifi network. It was detected as a host but no passwords were retrieved. Nothing was appended to the main file like in the video shown on pcsci3nce.info. Any idea there?