Unable to upgrade to Ubuntu 13.10 from Ubuntu 13.04

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http://askubuntu.com – I am new to Ubuntu and I am loving it ! I am using Ubuntu 13.04 , and I want to upgrade to the latest Ubuntu 13.10 , but am unable to. Here is what I am doing : Open "Software Updater" - it checks for the list of available updates/upgrades and comes up with the message : The Software on this computer is up to date. However,Ubuntu 13.10 is now available(you have 13.04). It gives me a list of options : Settings Upgrade.. OK I click on - Upgrade The authentication window comes up,and I give my password. Now , nothing happens ... Please help ! Thanks (HowTos)