W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7FB8BEE0A1F196A8
W: GPG error: http://download.opensuse.org ./ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DC0A179E47E7FC8D
W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2EE5793634EF4A35
W: GPG error: http://linux.dropbox.com lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FC918B335044912E
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://dl.google.com stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A040830F7FAC5991

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://dl.google.com stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A040830F7FAC5991

W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release

W: Failed to fetch http://dl.google.com/linux/talkplugin/deb/dists/stable/Release

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