GPG Error Updating Ubuntu/Debian Packages

I am attempting to update my Ubuntu/Debian system and I am getting an error:

GPG error: http://deb.opera.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E585066A30C18A2B

What does it mean, and how can I resolve it?

Answers


Try following approach, is from there

The error NO_PUBKEY E585066A30C18A2B is the key for the Opera web browser. To correct the error, run the following code.

wget -O - http://deb.opera.com/archive.key | apt-key add -


sudo wget -O - http://deb.opera.com/archive.key | apt-key add
--2016-09-24 09:42:48--  http://deb.opera.com/archive.key
Resolving deb.opera.com (deb.opera.com)... 185.26.183.130
Connecting to deb.opera.com (deb.opera.com)|185.26.183.130|:80...     connected.
HTTP request sent, awaiting response... ERROR: This command can only be     used by root.
200 OK
Length: 3152 (3,1K) [application/pgp-keys]
Saving to: ‘STDOUT’

-                     0%[                    ]       0  --.-KB/s    in 0s      


Cannot write to ‘-’ (Broken pipe).

Newer versions of apt also support

apt-key adv --fetch-keys https://deb.opera.com/archive.key

instead of

wget -qO - https://deb.opera.com/archive.key | apt-key add -

Additionally, you should always use https when loading the key.


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