apt-get update does not work [duplicate]
I tried some of the ip addresses on my browser and sure enough looking at the list I noticed . . . These are all for "updates" and "security" updates which are no longer provided because 13.04 is EOL - LOL.
There are no updates for this version of Ubuntu anymore. You must use a newer version of Ubuntu or remove the update & security URLs from /etc/apt/sources.list which I do not recommend.
http://archive.ubuntu.com/ubuntu/dists/raring = 404 not found
however
http://archive.ubuntu.com/ubuntu/dists/precise = connection