鉴于Ubuntu官方的源现在连不上，问问大家自己习惯用的源

Error: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/l/linux-firmware/linux-firmware_20250317.git1d4c88ee-0ubuntu1.6_amd64.deb 500 Internal Server Error [IP: 185.125.190.36 80]

瞄了下Ubuntu社区里面也有其他网友反馈这个问题
Problem With Updates: Error Failed to Fetch - Support and Help - Ubuntu Community Hub
https://discourse.ubuntu.com/t/problem-with-updates-error-failed-to-fetch/66688