修改sources.list文件：
leafpad /etc/apt/sources.list
#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
deb http://security.kali.org/kali-security kali-rolling/updates main contrib non-free
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