kali修改更新源及更新

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