ufans.top之前介绍过Ubuntu22.04及更低版本更换源的方法，详见本站。

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。步骤如下：

1）更新前备份

备份源文件

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

编辑源文件

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

默认的配置如下：

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

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

2）更换为国内镜像源：将上述配置每行前加#成为注释，添加以下镜像源，根据速度选择其一即可。

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

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

更改为 阿里源

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

更改为 清华源

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

更改为 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