Updating not possible

Sometimes, at startup, there is a message that updates are available.
Wen I try to update , after some time, a message appears : database not valid or corrupt (PGP signature). Failed to synchronize databases.
I try this but nothing happens.
Wen I restart, it says that the system is up-to-date !
What happens here and how to solve this ?
Thanks in advance for your reply.
Best regards.

Open a terminal and try

sudo pacman-mirrors -f 5 && sudo pacman -Syyu

This question has been answered many times.


Problem solved by :

Thank you.
Best regards.

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