Hit http://mn.archive.ubuntu.com jaunty-updates/multiverse Sources
Fetched 190B in 3s (48B/s)
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
wget -O - http://deb.opera.com/archive.key | sudo apt-key add -
Эх сурвалж:
http://raywoodcockslatest.blogspot.com/2009/09/gpg-error-public-key-not-available.html