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[ubuntu] Some errors while doing the update

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linux-howto

http://ubuntuforums.org – Hi Everybody, I am facing some errors after the update is done: Code: Reading package lists... Done 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 1DB8ADC1CFCA9579 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 531EE72F4C9D234C 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 09A559 (Hardware)