Ubuntu 更换国内apt源

以阿里云源为例
查看系统版本

lsb_release -rc

备份当前源

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

打开源文件

sudo vim/etc/apt/sources.list

更换为如下

deb http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse 
deb http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse 
deb http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse 
deb http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse 
deb http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse 
deb-src http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse 
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse 
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse 
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse 
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse

jammy为系统版本，如不是jammy，自行替换为当前系统版本即可
更新源

sudo apt-get update

更新软件

sudo apt-get upgrade