I have a precise64 box where 'apt-get update' is producing the following error:
GPG error: https://oss-binaries.phusionpassenger.com precise Release: The following signatures were invalid: BADSIG 561F9B9CAC40B2F7 Phusion Automated Software Signing (Used by automated tools to sign software packages) <auto-software-signing@phusion.nl>
I ran the following prior (as per http://blog.phusion.nl/2013/09/11/debian-and-ubuntu-packages-for-phusion-passenger/):gpg --keyserver keyserver.ubuntu.com --recv-keys 561F9B9CAC40B2F7gpg --armor --export 561F9B9CAC40B2F7 | sudo apt-key addAnd 'sudo apt-key list' gives a list that includes
pub 4096R/AC40B2F7 2013-06-30uid Phusion Automated Software Signing (Used by automated tools to sign software packages) <auto-software-signing@phusion.nl>sub 4096R/4DB76CB6 2013-06-30