When I try to follow the instructions at http://ubuntuzilla.wiki.sourceforge.net/ on adding the package signing key to my keyring, I get a "not found" error:
$ sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com C1289A29
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --recv-keys --keyserver keyserver.ubuntu.com C1289A29
gpg: requesting key C1289A29 from hkp server keyserver.ubuntu.com
gpgkeys: key C1289A29 not found on keyserver
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0