更新apt源头

# 查看linux中版本信息
cat /etc/issue

cat /proc/version 

uname -a

镜像加速

CentOS系统

1、先安装wget命令及备份原文件：

yum install -y wget && mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2、下载新的CentOS-Base.repo 到/etc/yum.repos.d/

备注：海外节点用阿里云，国内节点阿里或163都可以.

CentOS 6

阿里源：wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

163源：wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS6-Base-163.repo

CentOS 7

阿里源：wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

163源：wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo

3：下载完成后,修改源文件连接为https

编辑/etc/yum.repos.d/CentOS-Base.repo，将里面所有的http修改为https

4：最后清理升级并重新生成缓存

yum clean all && yum makecache

Debian系统

1、先安装 apt-get update && apt-get install -y apt-transport-https
2、编辑 /etc/apt/sources.list , 删除所有默认的源并替换为以下内容(操作前请做好相应备份)
3、替换完成后需要清理并刷新源：rm -rf /var/lib/apt/lists/ && apt-get update

Debian 10(buster)

阿里源：

deb https://mirrors.aliyun.com/debian/ buster main
deb-src https://mirrors.aliyun.com/debian/ buster main
deb https://mirrors.aliyun.com/debian/ buster-updates main
deb-src https://mirrors.aliyun.com/debian/ buster-updates main
deb https://mirrors.aliyun.com/debian/ buster-backports main
deb-src https://mirrors.aliyun.com/debian/ buster-backports main
deb https://mirrors.aliyun.com/debian-security buster/updates main
deb-src https://mirrors.aliyun.com/debian-buster stretch/updates main

163源：

deb https://mirrors.163.com/debian/ buster main
deb-src https://mirrors.163.com/debian/ buster main
deb https://mirrors.163.com/debian/ buster-updates main
deb-src https://mirrors.163.com/debian/ buster-updates main
deb https://mirrors.163.com/debian/ buster-backports main
deb-src https://mirrors.163.com/debian/ buster-backports main
deb https://mirrors.163.com/debian-security/ buster/updates main
deb-src https://mirrors.163.com/debian-security/ buster/updates main

**Debian 9(stretch)**：

阿里源

deb https://mirrors.aliyun.com/debian/ stretch main
deb-src https://mirrors.aliyun.com/debian/ stretch main
deb https://mirrors.aliyun.com/debian/ stretch-updates main
deb-src https://mirrors.aliyun.com/debian/ stretch-updates main
deb https://mirrors.aliyun.com/debian/ stretch-backports main
deb-src https://mirrors.aliyun.com/debian/ stretch-backports main
deb https://mirrors.aliyun.com/debian-security stretch/updates main
deb-src https://mirrors.aliyun.com/debian-security stretch/updates main

163源

deb https://mirrors.163.com/debian/ stretch main
deb-src https://mirrors.163.com/debian/ stretch main
deb https://mirrors.163.com/debian/ stretch-updates main
deb-src https://mirrors.163.com/debian/ stretch-updates main
deb https://mirrors.163.com/debian/ stretch-backports main
deb-src https://mirrors.163.com/debian/ stretch-backports main
deb https://mirrors.163.com/debian-security/ stretch/updates main
deb-src https://mirrors.163.com/debian-security/ stretch/updates main

Debian 8(jessie)

阿里源

deb https://mirrors.aliyun.com/debian/ jessie main
deb-src https://mirrors.aliyun.com/debian/ jessie main
deb https://mirrors.aliyun.com/debian-security/ jessie/updates main
deb-src https://mirrors.aliyun.com/debian-security/ jessie/updates main

163源

deb https://mirrors.163.com/debian/ jessie main
deb-src https://mirrors.163.com/debian/ jessie main
deb https://mirrors.163.com/debian-security/ jessie/updates main
deb-src https://mirrors.163.com/debian-security/ jessie/updates main

**Debian 7(wheezy)**：

阿里源

deb https://mirrors.aliyun.com/debian/ wheezy main
deb-src https://mirrors.aliyun.com/debian/ wheezy main
deb https://mirrors.aliyun.com/debian-security/ wheezy/updates main
deb-src https://mirrors.aliyun.com/debian-security/ wheezy/updates main

163源

deb https://mirrors.163.com/debian/ wheezy main
deb-src https://mirrors.163.com/debian/ wheezy main
deb https://mirrors.163.com/debian-security/ wheezy/updates main
deb-src https://mirrors.163.com/debian-security/ wheezy/updates main

Ubuntu系统

阿里源：https://opsx.alibaba.com/mirror

163源：https://mirrors.163.com/.help/ubuntu.html

清华源： https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/

阿里源：

deb https://mirrors.aliyun.com/debian/ buster main
deb-src https://mirrors.aliyun.com/debian/ buster main
deb https://mirrors.aliyun.com/debian/ buster-updates main
deb-src https://mirrors.aliyun.com/debian/ buster-updates main
deb https://mirrors.aliyun.com/debian/ buster-backports main
deb-src https://mirrors.aliyun.com/debian/ buster-backports main
deb https://mirrors.aliyun.com/debian-security buster/updates main
deb-src https://mirrors.aliyun.com/debian-buster stretch/updates main

163源：

deb https://mirrors.163.com/debian/ buster main
deb-src https://mirrors.163.com/debian/ buster main
deb https://mirrors.163.com/debian/ buster-updates main
deb-src https://mirrors.163.com/debian/ buster-updates main
deb https://mirrors.163.com/debian/ buster-backports main
deb-src https://mirrors.163.com/debian/ buster-backports main
deb https://mirrors.163.com/debian-security/ buster/updates main
deb-src https://mirrors.163.com/debian-security/ buster/updates main

清华大学源

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse

执行

apt update

如果报错 Certificate verification failed: The certificate is NOT trusted.

把软件源里的https改成http就行了