2020.1 kali 原因：
过程：
vi /etc/apt/sources.list
# 官方源
# deb-src https://http.kali.org/kali/ kali-rolling main non-free contrib
deb https://mirrors.ustc.edu.cn/kali kali-rolling main non-free contrib
deb https://http.kali.org/kali kali-rolling main non-free contribvi /etc
