Chrome Version       : latest
URLs (if applicable) :
Other browsers tested:
  Add OK or FAIL, along with the version, after other browsers where you
have tested this issue:
     Safari:
    Firefox:
         IE:

What steps will reproduce the problem?
(1) install or update chrome on ubuntu
(2)
(3)

What is the expected result?
no errors

What happens instead?
errors

Please provide any additional information below. Attach a screenshot if
possible.

Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Get:2 http://dl.google.com/linux/chrome/deb stable Release [1,189 B]           
Get:3 http://dl.google.com/linux/chrome/deb stable Release.gpg [819 B]         
Hit:4 http://us.archive.ubuntu.com/ubuntu xenial InRelease                     
Err:3 http://dl.google.com/linux/chrome/deb stable Release.gpg                 
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6494C6D6997C215E
Get:5 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Get:6 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]     
Get:7 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]  
Fetched 307 kB in 0s (445 kB/s)                                                
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dl.google.com/linux/chrome/deb stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6494C6D6997C215E
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6494C6D6997C215E
W: Some index files failed to download. They have been ignored, or old ones used instead.