Arch: FAILED (unknown public key 2E1AC68ED40814E0)

gpg --recv-keys --keyserver hkp://pgp.mit.edu 2E1AC68ED40814E0 or gpg --recv-keys --keyserver http://pgp.mit.edu:11371 2E1AC68ED40814E0 or sudo pacman-key -r 2E1AC68ED40814E0