kali linux修改更新源及更新
#1、修改sources.list源文件：

    leafpad /etc/apt/sources.list

    #aliyun 阿里云
    deb http://mirrors.aliyun.com/kali kali-rolling main non-free contrib
    deb-src http://mirrors.aliyun.com/kali kali-rolling main non-free contrib

    # ustc 中科大
    deb http://mirrors.ustc.edu.cn/kali kali-rolling main non-free contrib
    deb-src http://mirrors.ustc.edu.cn/kali kali-rolling main non-free contrib
    #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

    # kali 官方源
    deb http://http.kali.org/kali kali-rolling main non-free contrib 
    deb-src http://http.kali.org/kali kali-rolling main non-free contrib 

    # 默认的，可以注释掉不用管
    #deb http://security.kali.org/kali-security kali-rolling/updates main contrib non-free
    #deb-src http://security.kali.org/kali-security kali-rolling/updates main contrib non-free

#2、更新一下源：

apt-get update

#3、更新系统：

apt-get dist-upgrade

#4、清理安装包：

    apt-get clean
    apt-get autoclean