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W: GPG error: http://apt.newrelic.com newrelic Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B31B29E5548C16BF

W: Failed to fetch gzip:/var/lib/apt/lists/partial/ppa.launchpad.net_yannubuntu_boot-repair_ubuntu_dists_precise_main_i18n_Translation-en%5fUS  Encountered a section with no Package: header

W: Failed to fetch gzip:/var/lib/apt/lists/partial/ppa.launchpad.net_yannubuntu_boot-repair_ubuntu_dists_precise_main_i18n_Translation-en  Encountered a section with no Package: header

W: Failed to fetch gzip:/var/lib/apt/lists/partial/apt.newrelic.com_debian_dists_newrelic_non-free_i18n_Translation-en%5fUS  Encountered a section with no Package: header

W: Failed to fetch gzip:/var/lib/apt/lists/partial/apt.newrelic.com_debian_dists_newrelic_non-free_i18n_Translation-en  Encountered a section with no Package: header

W: Failed to fetch gzip:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_precise_main_i18n_Translation-en%5fUS  Encountered a section with no Package: header

W: Failed to fetch gzip:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_precise_main_i18n_Translation-en  Encountered a section with no Package: header

E: Some index files failed to download. They have been ignored, or old ones used instead.

I did "sudo apt-get clean" .. Still am facing the same error. Please help me to fix this issue.

marked as duplicate by rɑːdʒɑ, Mitch, con-f-use, Luis Alvarado Apr 3 '13 at 13:07

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