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 in root terminal:

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 this run
gpg: keyring `/root/.gnupg/secring.gpg' created gpg: keyring `/root/.gnupg/pubring.gpg' created
gpg: requesting key 7FA3303E from hkp server keys.gnupg.net
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key 7FA3303E: public key "Raspberry Pi Archive Signing Key" imported gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)

Then import it:

in root# gpg -a --export 82B129927FA3303E| apt-key add - OK 

Other possible solution:

wget http://archive.raspbian.org/raspbian.public.key -O - | sudo apt-key add -

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