Linux 更换命令下载源

1. Debian/Ubuntu (APT源)

# 备份原文件
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

# 编辑源列表文件
sudo nano /etc/apt/sources.list

# ubuntu（使用阿里云源）
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse

# Kali
# 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

# 更新源缓存
sudo apt update

2. CentOS/RHEL (YUM源)

# 备份原文件
sudo cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak

# 下载新的源配置文件（以阿里云为例）
sudo wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

# 更新缓存
sudo yum makecache