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 kali-rolling main non-free contrib deb http://mirrors.aliyun.com/kali-security/ kali-rolling main contrib non-free deb-src http://mirrors.aliyun.com/kali-security/ kali-rolling main contrib non-free
apt-get update
apt-get upgrade（之前错误为ape-get upgrade）
apt-get dist-upgrade
apt-get clean