备份默认源：
sudo cp /etc/apt/source.list /etc/apt/source.list.bak
sudo vi /etc/apt/source.list
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
更新：
sudo apt update
sudo apt upgrade
