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sudo sh -c "echo 'deb http://download.opensuse.org/repositories/home:/p_conrad:/coins/xUbuntu_14.04/ /' >> /etc/apt/sources.list.d/namecoin.list"
sudo apt-get update
sudo apt-get install namecoin
W: GPG error: http://download.opensuse.org Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 29D8C8DAC4447CF3
Any idea whats wrong and how I can solve this?