vim /etc/apt/sources.list

 

#阿里云deb http://mirrors.aliyun.com/kali kali-rolling main non-free contribdeb-src http://mirrors.aliyun.com/kali kali-rolling main non-free contrib#清华大学源deb http://mirrors.tuna.tsinghua.edu.cn/kali kali-rolling main contrib non-freedeb-src https://mirrors.tuna.tsinghua.edu.cn/kali kali-rolling main contrib non-free

直接将上面的源复制到：  /etc/apt/sources.list中

将不用的源，前面加 #,注释掉

然后点ESC ：wq！强制保存退出

更新源

apt-get update