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I'll try to find an earlier Q&A that I've seen about a similar question, but for now: it could well be that there is a proxy or firewall between you and packages.ros.org that is interfering with your network traffic. We've seen that before.

What you could perhaps try is to see whether any of the mirrors in China do work. See wiki/ROS/Installation/UbuntuMirrors for the global list of mirrors.

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