pacman --sysroot /mnt/r -S vlc
resolving dependencies...
looking for conflicting packages...

Packages (1) vlc-3.0.3-2

Total Download Size:   10.57 MiB
Total Installed Size:  54.78 MiB
Net Upgrade Size:      -1.12 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages...
 vlc-3.0.3-2-x86_64                                                          10.6 MiB  1964K/s 00:06 [############################################################] 100%
(1/1) checking keys in keyring                                                                       [############################################################] 100%
error: GPGME error: Invalid crypto engine
(1/1) checking package integrity                                                                     [############################################################] 100%
error: GPGME error: Invalid crypto engine
error: vlc: missing required signature
:: File /var/cache/pacman/pkg/vlc-3.0.3-2-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] y
error: failed to commit transaction (invalid or corrupted package (PGP signature))
Errors occurred, no packages were upgraded.