Upgrading Ubuntu from 13.04 to 13.10 [duplicate]

How do I go about installing Ubunbu 13.10?

I have downloaded the distribution already, after acquiring an ebay computer with Ubuntu 13.04 pre-installed. Please can anyone instruct me?

The method shown here should work:

First make sure that your data is backed up, and that you have a fast internet connection.

First Update:

 sudo apt-get update && sudo apt-get dist-upgrade

Open 'Software Updater':

Press 'Upgrade':

It should then prompt this - Start the Upgrade...

...wait a while...

and reboot.

If prompted to remove 'obsolete' packages, you can do as you like. Note that with some you may have difficulty installing them, as they may only be available for 13.04 raring and not 13.10 saucy