12/10/2017 (Sun) 12:18:22
Resisting my natural instinct to tell you to shut up or leave, Debian.
>I am in doubt between the backbox and Kali Linux
You are too stupid or mexican for those.
>I have a 4GB pendrive, is it enough to change the operating system?
Some usb sticks work, some don't. Size isn't really an issue, it's whether it boots. Sandisk works well IIRC. Flash the iso with unetbootin, set your bios to boot the usb and see if it works.