Ubuntu apt-get is telling me Public Key Not Available

okevin

okevin

For some reason I am getting an error message when I try to install opera-stable.

Here is output from my console.

I am not really too familiar with the way apt deals with the security keys but I wondered if it might be something wrong on the server.

$ sudo apt update

Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease

Get:2 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]

Hit:3 http://ppa.launchpad.net/ondrej/php/ubuntu xenial InRelease

Get:4 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]

Hit:5 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease

Get:6 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]

Get:7 https://deb.opera.com/opera-stable stable InRelease [2,592 B]

Err:7 https://deb.opera.com/opera-stable stable InRelease

The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D615560BA5C7FF72

Fetched 309 kB in 1s (276 kB/s)

Reading package lists... Done

Building dependency tree

Reading state information... Done

1 package can be upgraded. Run 'apt list --upgradable' to see it.

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://deb.opera.com/opera-stable stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D615560BA5C7FF72

W: Failed to fetch https://deb.opera.com/opera-stable/dists/stable/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D615560BA5C7FF72

W: Some index files failed to download. They have been ignored, or old ones used instead.

A Former User

In a terminal and in that order

wget https://deb.opera.com/archive.key
sudo apt-key add archive.key
sudo apt-get update

and you are done