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$ sudo pacman -Syu
[sudo] password for jrs: 
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
:: Synchronising package databases...
 core                  140,5 KiB   755 KiB/s 00:00 [######################] 100%
 extra                   7,9 MiB  2,26 MiB/s 00:03 [######################] 100%
 multilib              142,0 KiB  1145 KiB/s 00:00 [######################] 100%
error: GPGME error: No data
error: GPGME error: No data
error: GPGME error: No data
error: failed to synchronize all databases (invalid or corrupted database (PGP signature))