me@server:~$ sudo apt-key list /etc/apt/trusted.gpg -------------------- pub 1024D/437D05B5 2004-09-12 uid Ubuntu Archive Automatic Signing Key <email address hidden> sub 2048g/79164387 2004-09-12
pub 1024D/FBB75451 2004-12-30 uid Ubuntu CD Image Automatic Signing Key <email address hidden>
pub 1024R/4C9D234C 2010-01-20 uid Launchpad webupd8
pub 4096R/C0B21F32 2012-05-11 uid Ubuntu Archive Automatic Signing Key (2012) <email address hidden>
pub 4096R/EFE21092 2012-05-11 uid Ubuntu CD Image Automatic Signing Key (2012) <email address hidden>
me@server:~$ sudo apt-key update gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key <email address hidden>" not changed gpg: key FBB75451: "Ubuntu CD Image Automatic Signing Key <email address hidden>" not changed gpg: key C0B21F32: "Ubuntu Archive Automatic Signing Key (2012) <email address hidden>" not changed gpg: key EFE21092: "Ubuntu CD Image Automatic Signing Key (2012) <email address hidden>" not changed gpg: Total number processed: 4 gpg: unchanged: 4
me@server:~$ sudo apt-key list trusted. gpg ------- ------
/etc/apt/
-------
pub 1024D/437D05B5 2004-09-12
uid Ubuntu Archive Automatic Signing Key <email address hidden>
sub 2048g/79164387 2004-09-12
pub 1024D/FBB75451 2004-12-30
uid Ubuntu CD Image Automatic Signing Key <email address hidden>
pub 1024R/4C9D234C 2010-01-20
uid Launchpad webupd8
pub 4096R/C0B21F32 2012-05-11
uid Ubuntu Archive Automatic Signing Key (2012) <email address hidden>
pub 4096R/EFE21092 2012-05-11
uid Ubuntu CD Image Automatic Signing Key (2012) <email address hidden>
me@server:~$ sudo apt-key update
gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key <email address hidden>" not changed
gpg: key FBB75451: "Ubuntu CD Image Automatic Signing Key <email address hidden>" not changed
gpg: key C0B21F32: "Ubuntu Archive Automatic Signing Key (2012) <email address hidden>" not changed
gpg: key EFE21092: "Ubuntu CD Image Automatic Signing Key (2012) <email address hidden>" not changed
gpg: Total number processed: 4
gpg: unchanged: 4