Dopo dura riflessione, Roby ha scritto :
> Andy Burns wrote:
>> Roby wrote:
>>
>>> But if due to the SD problems (read only) sudo apt-get update can't write
>>> the updates in the SD, the error 404 automatically remains ..... don't you
>>> think it can work like this ?
>>
>> Let me jump into the thread here, and let me be blunt ...
>>
>> we *know* it can't work like that.
>>
>> The 404 error is 100% certainly the server saying "I haven't got the file
>> you asked for". It's possible you do have a faulty SD card, but it's
>> impossible for your SD card (faulty or not) to cause a 404 error.
>
> Thank you @Andy Burns for saying your opinion .... but from how you write it
> seems to be technically verified ...
> Initially I also thought it was like that, but I'm not an expert on RPI3....
> Then I did various tests and I asked for advice (in this newsgroup) to people
> who have more experience than me with the RPI (... or at least it is assumed
> to be so ....) and having failed to find the reasons for the problems I
> stopped at the 'faulty SD' speech .... and some people shared it ...
> At this point, only when I go to the remote site will I be able to understand
> what happened (.. I hope). Surely the first thing I will do is replace the SD
> with a clone that I had prepared when the system worked well ...
> Thank you

Tests from the REMOTE site.
From my usual home, before going to the remote location, I updated the
SD16 GB backup card of the remote RPI3.
After typing sudo apt-get update and then upgrade everything went fine.
The RPI3 has now installed 4.9.35-v7 + # 1014 SMP Fri Jun 30 14:47:43
BST 2017 armv7l GNU / Linux and everything is working properly.
I go to the remote location, the one with Huawei E392 USB 4G and AVM
3390 router, I connect the RPI3 to a 10/100 switch (previously it was
connected to a 1000 switch) everything works normally BUT:
- the 404 error with sudo apt.get update is the same as before;
- with speedtest-cli the download is ZERO Mbit/s as before.

MYSTERY :/ !!! I do not know what to do.
If someone comes to mind something will be welcome, just let me know
what commands to give ....
Thank you

--
Roby

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