一、更换国内源

1.Debian

备份当前源：mv /etc/apt/sources.list /etc/apt/sources.list.bak
编辑更新源：vim /etc/apt/sources.list
按 “i” 进入插入模式，编辑完成按”ESC”退出编辑模式，输入”:wq”保存文件

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#阿里云
deb http://mirrors.aliyun.com/debian/ stretch main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ stretch main non-free contrib
deb http://mirrors.aliyun.com/debian-security stretch/updates main
deb-src http://mirrors.aliyun.com/debian-security stretch/updates main
deb http://mirrors.aliyun.com/debian/ stretch-updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ stretch-updates main non-free contrib
deb http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib

Debian其他更新源：Debian GNU/Linux 换源

2.Ubuntu

备份当前源：mv /etc/apt/sources.list /etc/apt/sources.list.bak
编辑更新源：vim /etc/apt/sources.list
按 “i” 进入插入模式，编辑完成按”ESC”退出编辑模式，输入”:wq”保存文件

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#阿里云
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

Ubuntu其他更新源：Ubuntu18.04更换国内源（阿里，网易，中科大，清华等源

3.Kali

备份当前源：mv /etc/apt/sources.list /etc/apt/sources.list.bak
编辑更新源：vim /etc/apt/sources.list
按 “i” 进入插入模式，编辑完成按”ESC”退出编辑模式，输入”:wq”保存文件
阿里云更新源：

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#阿里云
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
Kali其他更新源：我与Kali-Linux：换源（更换国内源）

4.Centos

参考文章：Linux：centos7 更新源