ubuntu更改国内镜像

1.查看Linux版本号，确认自己系统的版本号，方便使用相对应的镜像文件：（此处以Linux22.04为例）

kui@ubuntu:~/Desktop$ lsb_release -c  #代码
Codename:	focal    #回应

2.首先备份原来的软件源并另存：

kui@ubuntu:~/Desktop$ sudo cp -v /etc/apt/sources.list /etc/apt/sources.list.backup  #代码
'/etc/apt/sources.list' -> '/etc/apt/sources.list.backup'  #回应

3.执行chmod命令更改文件权限使软件源文件可编辑：

kui@ubuntu:~/Desktop$ sudo chmod 777 /etc/apt/sources.list

4.1通过gedit命令编辑软件源：

sudo gedit /etc/apt/sources.list

4.2或者使用vim编辑器编辑软件源

vim /etc/apt/sources.list

（vim编辑器使用：键入’i’进入可编辑状态，键入’ESC’退出可编辑状态，键入’:wq’、'Enter’保存并退出）

5.删除全部文件，并把镜像文件粘贴进去（二选一）

阿里云镜像源：

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

清华源：

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan main restricted universe multiversedeb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan main restricted universe multiversedeb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-updates main restricted universe multiversedeb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-updates main restricted universe multiversedeb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-backports main restricted universe multiversedeb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-backports main restricted universe multiversedeb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-security main restricted universe multiversedeb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-security main restricted universe multiversedeb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-proposed main restricted universe multiversedeb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ eoan-proposed main restricted universe multiverse

6.修改完软件源后，更新软件列表和软件：

sudo apt update  #更新软件列表

sudo apt upgrade  #更新软件

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