nethunter sources.list update fix
open nethunter terminal
# mv /etc/apt/sources.list /sdcard
deb http://http.kali.org/kali kali-rolling main contrib non-free
# For source package access, uncomment the following line
# deb-src http://http.kali.org/kali kali-rolling main contrib non-free
vim sources.list on /sdcard, copy / paste above to file and save
# mv /sdcard/source.list /etc/apt/sources.list
# apt-get update