When I try to do:
sudo pacman -Suy
I got:
installing gdb-common (10.1-4) breaks dependency ‘gdb-common=9.2’ required by gdb-multiarch
What should I do? Thanks
Ok, I found the solution.
Deleted gdb-multiarch then updating going normaly.
Thx!
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Welcome aboard! 
Great that you got it solved!
It is not uncommon that AUR packages cause trouble for the official packages.
That’s why I’d recommend always prefer the (similar) official package over an AUR package.