debian NO_PUBKEY 1C4CBDCDCD2EFD2A

Error:
GPG error: Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1C4CBDCDCD2EFD2A

Solution:
gpg -a --output /tmp/pub.asc --export 1C4CBDCDCD2EFD2A sudo apt-key add /tmp/pub.asc && rm /tmp/pub.asc