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I keep getting this error every time I do sudo apt-get update in the terminal. Also I'm completely incapable of installing anything through the terminal, even after adding the required, up-to-date repository using the add-apt-repository command. Any help will be appreciated.

GPG error: quantal Release: The following signatures were invalid: NODATA 1 NODATA 2
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marked as duplicate by jokerdino Apr 13 '13 at 6:31

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Try this to remove, clean and update source list.

  1. sudo rm /var/lib/apt/lists/* -vf

  2. sudo apt-get clean

  3. sudo apt-get update

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Works great, thanks :) – Michael Buchler Nov 12 '12 at 14:06
Works for me too! Thanks :) – Srikanth Jeeva May 29 '14 at 7:38

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