Abra seu terminal e digite como
apt-key list
Listará todas as chaves que você adicionou com seus IDs de chave pública. Eu tentei do seu jeito Eu vi o ID do pub do Google
abcdefgg@abcdefgg-virtual-machine:~$ wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
[sudo] password for abcdefgg:
OK
abcdefgg@abcdefgg-virtual-machine:~$ sudo sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'
abcdefgg@abcdefgg-virtual-machine:~$ apt-key list | grep google*
uid Google, Inc. Linux Package Signing Key <[email protected]>
abcdefgg@abcdefgg-virtual-machine:~$ apt-key list
/etc/apt/trusted.gpg
--------------------
pub 1024D/437D05B5 2004-09-12
uid Ubuntu Archive Automatic Signing Key <[email protected]>
sub 2048g/79164387 2004-09-12
pub 1024D/FBB75451 2004-12-30
uid Ubuntu CD Image Automatic Signing Key <[email protected]>
pub 4096R/C0B21F32 2012-05-11
uid Ubuntu Archive Automatic Signing Key (2012) <[email protected]>
pub 4096R/EFE21092 2012-05-11
uid Ubuntu CD Image Automatic Signing Key (2012) <[email protected]>
pub 1024D/3E5C1192 2010-09-20
uid Ubuntu Extras Archive Automatic Signing Key <[email protected]>
pub 1024D/7FAC5991 2007-03-08
uid Google, Inc. Linux Package Signing Key <[email protected]>
sub 2048g/C07CB649 2007-03-08
abcdefgg@abcdefgg-virtual-machine:~$