Preparing...
Synchronizing package databases...
Refreshing core.db...
Refreshing extra.db...
Refreshing community.db...
Refreshing multilib.db...
Error: multilib.db: GPGME error: No data
Error: multilib.db: GPGME error: No data
Error: multilib.db: GPGME error: No data
Error: multilib.db: GPGME error: No data
invalid or corrupted database (PGP signature)
Failed to synchronize databases
sudo rm -R /var/lib/pacman/sync
sudo pacman -Syu
# or
pacman upgrade --force-refresh