After running apt-get update, I get the following warnings. How do I get rid of them?
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W: GPG error: http://ppa.launchpad.net maverick Release: The following signatures were invalid: BADSIG 6E871C4A881574DE Launchpad PPA for Bisigi
W: GPG error: http://ppa.launchpad.net maverick Release: Unknown error executing gpgv
W: GPG error: http://ppa.launchpad.net maverick Release: Unknown error executing gpgv
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ppa.launchpad.net maverick Release: The following signatures were invalid: BADSIG 6D975C4791E7EE5E Launchpad PPA for XBMC for Linux
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ppa.launchpad.net maverick Release: The following signatures were invalid: BADSIG 6AF0E1940624A220 Launchpad PPA for TualatriX
W: GPG error: http://ppa.launchpad.net maverick Release: The following signatures were invalid: NODATA 1 NODATA 2
W: GPG error: http://ppa.launchpad.net maverick Release: Unknown error executing gpgv
W: GPG error: http://ubuntutym.u-toyama.ac.jp maverick-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ubuntutym.u-toyama.ac.jp maverick-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error: http://ubuntutym.u-toyama.ac.jp maverick-proposed Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: GPG error: http://ubuntutym.u-toyama.ac.jp maverick-backports Release: Unknown error executing gpgv
W: Failed to fetch http://ubuntutym.u-toyama.ac.jp/ubun...ts/Release.gpg rename failed, No such file or directory ( -> /var/lib/apt/lists/partial/ubuntutym.u-toyama.ac.jp_ubuntu_dists_maverick-backports_Release.gpg).
W: Failed to fetch http://ppa.launchpad.net/conkyhardco...ck/Release.gpg rename failed, No such file or directory ( -> /var/lib/apt/lists/partial/ppa.launchpad.net_conkyhardcore_ppa_ubuntu_dists_m averick_Release.gpg).
W: Failed to fetch http://ppa.launchpad.net/flozz/flozz...ck/Release.gpg rename failed, No such file or directory ( -> /var/lib/apt/lists/partial/ppa.launchpad.net_flozz_flozz_ubuntu_dists_maveric k_Release.gpg).
W: Failed to fetch http://ppa.launchpad.net/doctormo/pp...ck/Release.gpg rename failed, No such file or directory ( -> /var/lib/apt/lists/partial/ppa.launchpad.net_doctormo_ppa_ubuntu_dists_maveri ck_Release.gpg).
W: Failed to fetch http://ppa.launchpad.net/tualatrix/p...ck/Release.gpg rename failed, No such file or directory ( -> /var/lib/apt/lists/partial/ppa.launchpad.net_tualatrix_ppa_ubuntu_dists_maver ick_Release.gpg).
W: Failed to fetch http://ppa.launchpad.net/jd-team/jdo...verick/Release
W: Failed to fetch http://ppa.launchpad.net/norsetto/pp...verick/Release
W: Failed to fetch http://ubuntutym.u-toyama.ac.jp/ubun...curity/Release
W: Failed to fetch http://ppa.launchpad.net/doctormo/pp...rce/Sources.gz 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/doctormo/pp...86/Packages.gz 404 Not Found
W: Some index files failed to download, they have been ignored, or old ones used instead.
W: Duplicate sources.list entry http://archive.canonical.com/ubuntu/ maverick/partner i386 Packages (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_maverick_partne r_binary-i386_Packages)
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