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

The original from the official website is like above, we need to do some modification:

 

deb http://repo.kali.org/kali kali-rolling main contrib non-free
# For source package access, uncomment the following line
deb-src http://repo.kali.org/kali kali-rolling main contrib non-free