error: GPGME error: Invalid crypto engine
warning: Public keyring not found; have you run 'pacman-key --init'?
error: GPGME error: Invalid crypto engine
error: linux-libre-api-headers: missing required signature
:: File /var/cache/pacman/pkg/linux-libre-api-headers-5.3.1_gnu-1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] n   
error: tzdata: missing required signature
:: File /var/cache/pacman/pkg/tzdata-2019c-3-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n]