Ubuntu 24.04 给APT换国内源
Ubuntu 24.04下，APT源的格式相较之前有变动，之前的经验是不可用的。
路径： /etc/apt/sources.list.d/ubuntu.sources
打开这个路径：
cd /etc/apt/sources.list.d
sudo cp ubuntu.sources ubuntu.sources_cp
sudo rm -rf ubuntu.sources
sudo vim ubuntu.sources按i键，粘贴以下代码：
Types: deb URIs: https://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 Types: deb URIs: https://mirrors.aliyun.com/ubuntu/ Suites: noble noble-updates noble-security Components: main restricted universe multiverse Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg Types: deb URIs: https://repo.huaweicloud.com/ubuntu/ Suites: noble noble-updates noble-security Components: main restricted universe multiverse Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg Types: deb URIS: https://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包含了4个国内源。如需改动，只需改URIS那行，其他完全不需要动。
保存并退出vim。
:wq!
执行命令使得国内源生效：
sudo apt update
sudo apt upgrade完成。
