Public Key not available?

[Bob_Pyke]

New beta - apt-get update reports all sorts of errors

After logging in for the first time, I tried to update (and upgrade) the distribution but received all sorts of errors Get:1 http://apt.allstarlink.org/repos/asl_builds buster InRelease [7392 B] Hit:2 http://raspbian.raspberrypi.org/raspbian buster InRelease Hit:3 http://archive.raspberrypi.org/debian buster InRelease Err:1 http://apt.allstarlink.org/repos/asl_builds buster InRelease The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 6A72C389B51…