Beppo
abc-nix : I did what you propose.
It seems to have worked. It told me in terminal that numerous packages would be installed, that it would take a memory of 207 Mo (I said yes of course). I had many, many packets installed and it took more than a minute.
So, thank you very much. But the question now is, how to launch it.
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Sometimes, an up to date system is the best way to avoid problems.