I have a red warning sign in my toolbar. When I click on it, it asks me to check for updates. When I check for updates, I get this:
W:Failed to fetch http://dl.google.com/linux/deb/dists/testing/non-free/binary-amd64/Packages 404 Not Found [IP: 188.8.131.52 80] W:Failed to fetch http://dl.google.com/linux/deb/dists/testing/non-free/binary-i386/Packages 404 Not Found [IP: 184.108.40.206 80] E:Some index files failed to download. They have been ignored, or old ones used instead.
This happened to me once before when 12.04 was still in beta, but I can't remember what I did. It was a huge mess!
Sony Vaio VGN-NW220F