W: Failed to fetch https://deb.parrot.sh/parrot/dists/rolling-security/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 363A96A5CEA9EA27 code example

Example 1: W: Failed to fetch http://deb.parrotsec.org/parrot/dists/stable/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B56FFA946EB1660A

sudo apt-get --download-only --reinstall install resolvconf
sudo dpkg --purge --force-depends resolvconf
sudo apt-get install resolvconf

Example 2: W: Failed to fetch http://deb.parrotsec.org/parrot/dists/stable/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B56FFA946EB1660A

nameserver 8.8.8.8