W: GPG error: http://highlab.com jessie Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EF0D730CE9AD3D5D
linuxcnc@linuxcnc:/etc/apt$ sudo apt-key adv --keyserver hkp://keys.gnupg.net --recv-key E9AD3D5D
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.YDUMUQBVvn --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-security-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-stable.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-squeeze-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-squeeze-stable.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-wheezy-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-wheezy-stable.gpg --keyserver hkp://keys.gnupg.net --recv-key E9AD3D5D
gpg: requesting key E9AD3D5D from hkp server keys.gnupg.net
gpgkeys: key E9AD3D5D not found on keyserver
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
linuxcnc@linuxcnc:/etc/apt$ sudo apt-key adv --keyserver hkp://keys.gnupg.net --recv-key EF0D730CE9AD3D5D
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.0AWoL38CDx --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-security-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-jessie-stable.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-squeeze-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-squeeze-stable.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-wheezy-automatic.gpg --keyring /etc/apt/trusted.gpg.d/debian-archive-wheezy-stable.gpg --keyserver hkp://keys.gnupg.net --recv-key EF0D730CE9AD3D5D
gpg: requesting key E9AD3D5D from hkp server keys.gnupg.net
gpgkeys: key EF0D730CE9AD3D5D not found on keyserver
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
linuxcnc@linuxcnc:/etc/apt$