diff --git a/ubuntu-sources-22.04.md b/ubuntu-sources-22.04.md
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+备份 source.list 文件
+```
+cp /etc/apt/sources.list /etc/apt/sources.list.bak
+```
+```
+vim /etc/apt/sources.list
+```
+
+复制粘贴
+```
+deb http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse
+deb http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
+deb http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse
+deb http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse
+```
+
+更新
+```
+apt update
+```
+
+升级现有软件包（可选）
+```
+apt upgrade
+```
+
+修改 PPA 和第三方源（如果有的话）
+```
+/etc/apt/sources.list.d/
+```
+
+替换 ppa 文件的URL，一般将 ppa.launchpad.net 修改为 ppa.mirrors.aliyun.com
+```
+deb http://ppa.mirrors.aliyun.com/ppa/username/repositoryname/ jammy main
+```
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