thecpaptain@dascpaptain:~$ 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   4096R/C0B21F32 2012-05-11
uid                  Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com>

pub   4096R/EFE21092 2012-05-11
uid                  Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>

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

pub   2048R/8B29D817 2016-07-13
uid                  OpenFOAM Foundation <admin@openfoam.org>
sub   2048R/362662E8 2016-07-13

pub   4096R/2C52609D 2015-07-14
uid                  Docker Release Tool (releasedocker) <docker@docker.com>