I am using Ubuntu 13.04. I don't take the software updates that my system prompts me to.

Is there any use to upgrade my system to the latest ubuntu.

The reason I ask this is that when I do sudo apt-get update, I see alot of Failed to fetch ... 404 Not Found.

So my question is that is this 404 because I have not taken the latest ubuntu?

How exactly does this thing work, and how can I get rid of this error. I tried to install mysql, and it is giving me 404.

So I did the changes in my Sources.list

It still says: Err http://old-releases.ubuntu.com dists/restricted Sources 404 Not Found

And some more Error on extra.ubuntu.

What should I do?

When doing apt-get install mysql-server, it says:

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Package mysql-server is not available, but is referred to by another package.

This may mean that the package is missing, has been obsoleted, or

is only available from another source



E: Package 'mysql-server' has no installation candidate