I am getting this error after running update command:
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N: Ignoring file 'ubuntu-x-swat-x-updates-quantal.list-201303211251.backup' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
W: Failed to fetch http://ppa.launchpad.net/zeitgeist/ppa/ubuntu/dists/quantal/main/source/Sources 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/zeitgeist/ppa/ubuntu/dists/quantal/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/zeitgeist/ppa/ubuntu/dists/quantal/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
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sudo mv /var/lib/apt/lists{,bakjune4};
sudo mv /var/cache/apt/archives/partial{,bakjune4};
sudo apt-get update;
sudo apt-get upgrade;
Thanks,
Prabhat.