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

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

供替换的源

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

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