我要评论先备份原始源，再替换为阿里云源即可。
ubuntu 26.04（resolute raccoon）默认已经使用 .sources 格式，而不是老的 sources.list。
1. 备份原配置
sudo cp /etc/apt/sources.list.d/ubuntu.sources /etc/apt/sources.list.d/ubuntu.sources.bak
2. 编辑镜像源
sudo vim /etc/apt/sources.list.d/ubuntu.sources
将内容替换为：
types: deb uris: https://mirrors.aliyun.com/ubuntu/ suites: resolute resolute-updates resolute-backports components: main restricted universe multiverse signed-by: /usr/share/keyrings/ubuntu-archive-keyring.gpg types: deb uris: https://mirrors.aliyun.com/ubuntu/ suites: resolute-security components: main restricted universe multiverse signed-by: /usr/share/keyrings/ubuntu-archive-keyring.gpg
3. 更新缓存
sudo apt update
4. 验证是否生效
apt policy
或者：
grep -e "mirrors.aliyun.com" /etc/apt/sources.list.d/ubuntu.sources
一键脚本（推荐）
直接执行：
sudo bash -c 'cat > /etc/apt/sources.list.d/ubuntu.sources <<eof types: deb uris: https://mirrors.aliyun.com/ubuntu/ suites: resolute resolute-updates resolute-backports components: main restricted universe multiverse signed-by: /usr/share/keyrings/ubuntu-archive-keyring.gpg types: deb uris: https://mirrors.aliyun.com/ubuntu/ suites: resolute-security components: main restricted universe multiverse signed-by: /usr/share/keyrings/ubuntu-archive-keyring.gpg eof' sudo apt update
总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持代码网。
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