root@li732:/etc/apt# 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   4096R/F06FC659 2015-01-07
uid                  Launchpad PPA for J Fernyhough

pub   4096R/68576280 2014-06-13
uid                  NodeSource <gpg@nodesource.com>
sub   4096R/AA01DA2C 2014-06-13

pub   4096R/6A755776 2017-07-29
uid                  Launchpad PPA for deadsnakes

pub   1024R/EEA14886 2010-05-04
uid                  Launchpad VLC

pub   4096R/5C8DA04A 2017-07-11 [expires: 2019-07-11]
uid                  RethinkDB Packaging <packaging@rethinkdb.com>
sub   4096R/03D1F02B 2017-07-11 [expires: 2019-07-11]
sub   4096R/78C15B0E 2017-07-11 [expires: 2019-07-11]

pub   2048R/D88E42B4 2013-09-16
uid                  Elasticsearch (Elasticsearch Signing Key) <dev_ops@elasticsearch.org>
sub   2048R/60D31954 2013-09-16

/etc/apt/trusted.gpg.d/apt.postgresql.org.gpg
---------------------------------------------
pub   4096R/ACCC4CF8 2011-10-13
uid                  PostgreSQL Debian Repository

root@li732:/etc/apt#