一、源文件位置

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，升级24.04之后，而是使用如下文件

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

二、开始换源

1. 备份源配置文件

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

2. 编辑源配置文件

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

3. 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

 注释掉原来的

4. 更新

sudo apt-get update
sudo apt-get upgrade

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