kali 换源
sudo vim /etc/apt/sources.list
deb http://mirrors.tuna.tsinghua.edu.cn/kali kali-rolling main non-free contrib
deb-src http://mirrors.tuna.tsinghua.edu.cn/kali kali-rolling main non-free contrib
apt-get update &apt-get upgrade
# apt-get dist-upgrade --更新整个Debian系统，耗时
apt-get clean
reboot