进入源文件进行修改
leafpad /etc/apt/sources.list
（其实系统本身就自带了更新源，去掉其注释也是可以的，现在官方源的下载速度也还ok，下面的三选一亦可）
#kali官方源 deb http://http.kali.org/kali kali-rolling main non-free contrib
#中科大的源
deb http://mirrors.ustc.edu.cn/kali kali-rolling main non-free contrib
deb http://mirrors.ustc.edu.cn/kali kali-rolling main contrib non-free
deb-src http://mirrors.ustc.edu.cn/kali kali-rolling main contrib non-free
deb http://mirrors.ustc.edu.cn/kali-security kali-current/updates main contrib non-free
deb-src http://mirrors.ustc.edu.cn/kali-security kali-current/updates main contrib non-free
#阿里云源
deb http://mirrors.aliyun.com/kali sana main non-free contrib
deb http://mirrors.aliyun.com/kali-security/ sana/updates main contrib non-free
deb-src http://mirrors.aliyun.com/kali-security/ sana/updates main contrib non-free
apt-get update
ape-get upgrade
apt-get dist-upgrade
apt-get clean