pt-key list
/etc/apt/trusted.gpg
--------------------
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 4096R/D38B4796 2016-04-12
uid Google Inc. (Linux Packages Signing Authority) <linux-packages-keymaster@google.com>
sub 4096R/640DB551 2016-04-12 [verfällt: 2019-04-12]
pub 4096R/F6D61D45 2015-05-27 [verfällt: 2017-05-26]
uid Opera Software Archive Automatic Signing Key 2015 <packager@opera.com>
sub 4096R/26451C35 2015-05-27 [verfällt: 2017-05-26]
pub 1024R/EEA14886 2010-05-04
uid Launchpad VLC
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>