jonathan@jonathan-desktop:~$ sudo apt-key list
/etc/apt/trusted.gpg
--------------------
pub   1024D/437D05B5 2004-09-12
uid                  Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
sub   2048g/79164387 2004-09-12

pub   1024D/FBB75451 2004-12-30
uid                  Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>

pub   1024D/EEF818CF 2007-02-28
uid                  Scribus Debian Archive Signing Key <debian@scribus.info>

pub   1024D/0C5A2783 2006-11-23
uid                  Medibuntu Packaging Team <admin@lists.medibuntu.org>
uid                  The Medibuntu Team <medibuntu@sos-sts.com>
sub   2048g/16C7105A 2006-11-23

pub   1024D/6DFBCBAE 2008-07-14
uid                  Sun Microsystems, Inc. (xVM VirtualBox archive signing key) <info@virtualbox.org>
sub   2048g/78A86EAF 2008-07-14

pub   1024R/2FEF0CE2 2009-01-20
uid                  Launchpad PPA for Oliver Grawert

pub   1024D/7FAC5991 2007-03-08
uid                  Google, Inc. Linux Package Signing Key <linux-packages-keymaster@google.com>
sub   2048g/C07CB649 2007-03-08

pub   1024R/EC6B3CAD 2009-01-22
uid                  Launchpad PPA for Inkscape Nightly Uploader

pub   1024D/9D1A0061 2009-08-31 [expires: 2011-01-23]
uid                  Opera Software Archive Automatic Signing Key 2010 <packager@opera.com>
sub   4096g/87DEACAE 2009-08-31 [expires: 2011-01-23]

pub   1024D/AAFE086A 2008-04-19
uid                  Paul Gevers <paul.gevers@esac.climbing.nl>
uid                  Paul Gevers <paul@climbing.nl>
sub   2048g/39222519 2008-04-19

pub   4096R/46D7E7CF 2009-05-15
uid                  GetDeb Archive Automatic Signing Key <archive@getdeb.net>

pub   1024R/6B5D3F33 2009-01-23
uid                  Launchpad PPA for Stochastic

pub   1024D/98AB5139 2010-05-18
uid                  Oracle Corporation (VirtualBox archive signing key) <info@virtualbox.org>
sub   2048g/281DDC4B 2010-05-18

jonathan@jonathan-desktop:~$