Possible Duplicate:
How do I fix the GPG error “NO_PUBKEY”?
Ever since installing Ubuntu 11.10, I've been having trouble adding PPAs to my Software Sources. In the past I could add PPAs using the usual "ppa:appName/ppa" syntax in the Software Sources and it would automatically retrieve the key from Launchpad, etc.
Now I have to manually add the key using apt-key, and even this sometimes doesn't work, as in the case of the LibreOffice and Mozilla Stable PPAs. See errors below:
W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 83FBA1751378B444
W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1015216E75198A89
Is there a reason why keys do not get automatically retrieved any more? Can I fix this without doing a system reinstall?
sudo add-apt-repository ppa:appName/ppa
in the terminal?