alan@homeserver:~$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 40976EAF437D05B5
[sudo] password for alan: 
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.ZEKbzPavDK --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-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 --keyring /etc/apt/trusted.gpg.d/mc3man-trusty-media.gpg --keyring /etc/apt/trusted.gpg.d/ubuntu-sdk-team-ppa.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 40976EAF437D05B5
gpg: requesting key 437D05B5 from hkp server keyserver.ubuntu.com
gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>" 27 new signatures
gpg: Total number processed: 1
gpg:         new signatures: 27