 <p>Try following approach, is from <a href="http://www.vntweb.co.uk/no_pubkey-e585066a30c18a2b/" rel="nofollow">there</a></p> <blockquote> <p>The error <code>NO_PUBKEY E585066A30C18A2B</code> is the key for the Opera web browser. To correct the error, run the following code.</p> <p><code>wget -O - http://deb.opera.com/archive.key | apt-key add</code></p> </blockquote>