1. edit list file
-> /etc/apt/source.list
## Security Updates
deb http://security.kali.org/kali-security kali/updates main contrib non-free
deb-src http://security.kali.org/kali-security kali/updates main contrib non-free
## Application Install/Updates
deb http://http.kali.org/kali kali main contrib non-free
deb-src http://http.kali.org/kali kali main contrib non-free
2. #apt-get update
