专栏总目录

一、备份

        备份文件sources.list文件

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

二、编辑源文件

（一）安装geany

        如果使用vi也可以，个人感觉geany用的习惯而已

        安装命令如下： 

sudo apt install geany

（二）打开更新源文件

        在shell中输入下列命令，使用geany修改sources.list文件

sudo geany /etc/apt/sources.list

（三）修改更新源文件

        将下列内容复制到更新源文件

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy main restricted universe multiverse

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-updates main restricted universe multiverse

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-backports main restricted universe multiverse

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ jammy-security main restricted universe multiverse
 

三、执行设置的更新

        更新软件包列表

sudo apt update

        更新所有软件包

sudo apt upgrade