This is indeed not a bug but you simply didn't import the PPAs gpg key,
following dino99s suggestion or running
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com
8B9FBE5158B3AFA9
should resolve this.
** Changed in: ubuntu
Status: New => Invalid
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W: GPG error: http://ppa.launchpad.net hardy Release: The following signatures
couldn't be verified because the public key is not available: NO_PUBKEY
8B9FBE5158B3AFA9
https://bugs.launchpad.net/bugs/606382
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