well im a noob but i want to learn
so i follow this guide and everithing is fine

some remarks for noobs like me
1) u have to pre install rootfs easy-chroot and a vnc client ( i choose presence vnc ) and p7zip-full
2) the dowload and unzip take a long time cos I have only my dearer N900 to connect to internet and as computer
4) I follow all the steps from this guide and i have some errors that i have succesfully resolve by a little bit of googling around
5) I had also 1 error from the image : missing directory var/lib/pulse or whatever but i just mkdir this ( in chroot) and fixed
6) the step vncserver -geometry 800x470 : its better to edit the file /usr/bin/startvnc and change it there)

ok now i have that seems a ubuntu look alike ( thanks to the op and mr qole) with pentesting environment). I have to figure now how to play with all the stuff and how i can inject packets
thanks superdumb