URLs of substitutes

[Roman Riabenko]

Hello

Is it possible to get a URL for a substitute, for example for the Linux
kernel?

I am trying to troubleshoot connection to a substitute sever with my
tunnel broker, which is slow for this server for some reason and
eventually times out when running `guix system reconfigure
/etc/config.scm`. I considered showing wget output to the technical
support as an example but do not know how to find the URL.

Roman

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