GPG error

[yehlu]

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 19803648C18789EA
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 D0AFF96872D340A3
root@do2:~# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 19803648C18789EA
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --recv-keys --keyserver keyserver.ubuntu.com 19803648C18789EA
gpg: requesting key C18789EA from hkp server keyserver.ubuntu.com
gpg: key C18789EA: public key "Launchpad Personal Packages" imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
root@do2:~# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com D0AFF96872D340A3
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --recv-keys --keyserver keyserver.ubuntu.com D0AFF96872D340A3
gpg: requesting key 72D340A3 from hkp server keyserver.ubuntu.com
gpg: key 72D340A3: public key "Launchpad PPA for gwibber-daily" imported
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)