Configuring Wireshark
Non-root users haven't enough rights to capture packets. To allow non-root users to do that in BackBox Linux, just open a terminal and run:
$ sudo dpkg-reconfigure wireshark-common # then enter YES
$ sudo usermod -a -G wireshark $USER
Logout from the system and then login again.
The user is now allowed to capture traffic from all the devices the BackBox machine has.