添加 Ubuntu更换中科大镜像源.md

Ubuntu更换中科大镜像源.md

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+## Ubuntu 24.04
+
+```bash
+# 备份原文件（可选）
+sudo cp /etc/apt/sources.list.d/ubuntu.sources /etc/apt/sources.list.d/ubuntu.sources.bak
+```
+
+```bash
+sudo sed -i 's|http://archive.ubuntu.com|http://mirrors.ustc.edu.cn|g' /etc/apt/sources.list.d/ubuntu.sources
+```
+
+```bash
+sudo sed -i 's|http://security.ubuntu.com|http://mirrors.ustc.edu.cn|g' /etc/apt/sources.list.d/ubuntu.sources
+```
+
+```bash
+sudo apt update
+```