Dear community, after sudo apt-get update I get:
> W: GPG error: http://ppa.launchpad.net karmic Release: Die folgenden > Signaturen konnten nicht überprüft werden, weil ihr öffentlicher Schlüssel > nicht verfügbar ist: NO_PUBKEY 4822C80CB3227623 > W: Duplicate sources.list entry http://ppa.launchpad.net karmic/main > Packages > (/var/lib/apt/lists/ppa.launchpad.net_puredyne-team_ppa_ubuntu_dists_karmic_main_binary-i386_Packages) > W: Duplicate sources.list entry http://packages.medibuntu.org karmic/free > Packages > (/var/lib/apt/lists/packages.medibuntu.org_dists_karmic_free_binary-i386_Packages) > W: Duplicate sources.list entry http://packages.medibuntu.orgkarmic/non-free > Packages > (/var/lib/apt/lists/packages.medibuntu.org_dists_karmic_non-free_binary-i386_Packages) > How can I remove these errors and make these messages to disappear?
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