Ubuntu 13.04 (server ) update problem

I cannot update or install any package using apt-get update or install it says that:
W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/raring-updates/… 404 Not Found [IP: 80]

I checked the URL, I have seen there is no such kind of directory called Ubuntu-ports.

What should I do to correct that problem?

Hi, I am getting a similar problem.

I am running lubuntu on cubieboard2, I looked at the url and saw that there is no “raring” directory that is listed in the path:

Err http://ports.ubuntu.com/ubuntu-ports/ raring/main libreadline5 armhf 5.2+dfsg-1

404 Not Found [IP: 80]

Anyone have any ideas?

Welcome to ubuntu, raring went eol (Jan 27, 2014) so this was
expected. (In the last week they (ubuntu) purged ports.ubuntu.com of
both quantal & raring)