Error: root@datadroid:/root# apt-get update W: GPG error: http://archive.raspberrypi.org jessie InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 82B129927FA3303E To solve it: root@datadroid:/root# gpg --keyserver keys.gnupg.net --recv-key 82B129927FA3303E gpg: directory `/root/.gnupg' created gpg: new configuration file `/root/.gnupg/gpg.conf' created gpg: WARNING: options in `/root/.gnupg/gpg.conf' are not yet active during Read more...