Got really annoyed when I run
yay -Syuand encounter this error. And MORE HATE FOR MYSELF because I always forget how to fix this. That's the reason why I am here typing on my keyboard writing this post. I HAVE TO WRITE IT DOWN!
# find /var/cache/pacman/pkg/ -iname "*.part" -delete
Look for .part files (partially downloaded packages) in /var/cache/pacman/pkg/ and remove them (often caused by usage of a custom XferCommand in pacman.conf).
Some commands might help
pacman -Sy archlinux-keyring
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