*) 'sudo apt-get update' has been returning this error -
""" W: Failed to fetch http://ppa.launchpad.net/natesm/ease...source/Sources 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/natesm/ease...-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead. """
*) HINT :: I found that from the above URL, the 'quantal' doesn't exist. I mean - the URL is valid only till --
"" http://ppa.launchpad.net/natesm/ease/ubuntu/dists "" after which 'quantal' doesn't exist
*) QUESTION: Kindly let me know --> the reason for the missing 'quantal' and --> why it was ok once but not now.. Also, --> how am I expected to protect myself from falling into such errors in future