Roby  wrote:
> I R A Darth Aggie wrote:
>> What does a
>>
>> sudo apt-get update
>>
>> produce?
>
> As written in my first post of 03/18, with sudo apt-get update I have
> many 404 errors

You wrote: "Unfortunately I can't update the RPI3 with sudo apt-get update
because I have many mistakes like this: [...]" but apt-get update doesn't
update the Pi! It only updates the index files for the actual system
updates, and those you get with "sudo apt-get upgrade" (or sometimes a few
more, potentially including changes you might not want, with dist-upgrade).

But yeah, apt-get updates not being saved between reboots indicates sd card
trouble.

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