I got this error today:
After some sleuthing, me thinks it has to do with either the new version of Libre-Office (4.0) which I installed recently (instead of waiting for Updater to do so), or the Mint Cinnamom desktop, which I also added recently to my log in choice for a quick tryout.W:GPG error: http://ppa.launchpad.net quantal Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C2518248EEA14886, W:Failed to fetch http://ppa.launchpad.net/merlwiz79/c...source/Sources 404 Not Found
, W:Failed to fetch http://ppa.launchpad.net/merlwiz79/c...amd64/Packages 404 Not Found
, W:Failed to fetch http://ppa.launchpad.net/merlwiz79/c...-i386/Packages 404 Not Found
, E:Some index files failed to download. They have been ignored, or old ones used instead.
I was planning on UN-installing Cinnamon today anyway. Or how do you guys recommend I proceed?