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ERROR: BLACKARCH: SIGNATURE FROM "LEVON NOPTRIX KAYAN (BLACK ARCH DEVELOPER) <NOPTRIX@NULLSECURITY.NET> IS UNKNOWN TRUST"
ERROR: FAILED TO SYNCHRONIZE ALL DATABASES (INVALID OR CORRUPTED DATABASE (PGP SIGNATURE))

rm -rf /etc/pacman.d/gnupg

pacman-key --init

pacman-key --populate archlinux blackarch

pacman-key --update --keyserver keyserver.ubuntu.com