Open a terminal (Applications -> Accessories -> Terminal)
and type:
Code:
sudo apt-get update
The command should throw a similar warning:
Code:
Reading package lists... Done
W: GPG error: http://deb.opera.com stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F9A2F76A9D1A0061
W: You may want to run apt-get update to correct these problems
type:
Code:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9D1A0061
where 9D1A0061 are the last 8 digits from the public key mentioned in the warning.
and:
Code:
sudo apt-get update
https://launchpad.net/+help/soyuz/ppa-sources-list.html
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