W: GPG error: http://security.ubuntu.com bionic-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3B4FE6ACC0B21F32 code example

Example: he following signatures couldn't be verified because the public key is not available: NO_PUBKEY 363A96A5CEA9EA27

sudo apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-keys 363A96A5CEA9EA27