注意事项：版本说明！！！

Ubuntu24.04的源地址配置文件发生改变。

不再使用以前的 sources.list 文件，该文件内容变成了一行注释：

# Ubuntu sources have moved to /etc/apt/sources.list.d/ubuntu.sources

新的官方源配置放在了 /etc/apt/sources.list.d/ubuntu.sources，升级前的三方源被放在了 /etc/apt/sources.list.d/third-party.sources

24.04之前的源文件位置

/etc/apt/sources.list.d

24.04之后的源文件位置

/etc/apt/sources.list.d/ubuntu.sources

ps：以下配置我以24.04版本为例子 

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1. 备份原文件

在修改之前，可以选择备份原文件：

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

2. 更换镜像源

sudo vim /etc/apt/sources.list.d/ubuntu.sources

• 添加清华源配置

Types: deb
URIs: http://mirrors.tuna.tsinghua.edu.cn/ubuntu/
Suites: noble noble-updates noble-security
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

• 中科大源

Types: deb
URIs: http://mirrors.ustc.edu.cn/ubuntu/
Suites: noble noble-updates noble-security
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

• 阿里源

Types: deb
URIs: http://mirrors.aliyun.com/ubuntu/
Suites: noble noble-updates noble-security
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

• 网易源 

Types: deb
URIs: http://mirrors.163.com/ubuntu/
Suites: noble noble-updates noble-security
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

ps：更换后效果的配置文件 

3. 更新

sudo apt-get update

sudo apt-get upgrade -y

 下载时已经切换成阿里云镜像源进行下载