On 2019-03-22, Roby wrote:
>What does not work is the RPI3 that I have in the remote location 500
>km away from here (internet with router and 4G USB key)
>The second RPI3 that I have here at home with ADSL/FTTH has the exact
>same /etc/apt/sources.list as the remote one and IT WORKS!

Then probably something is messing with your internet connection,
perhaps a "transparent" http proxy.

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