How come the update manager won't let me upgrade to Ubuntu 12.10?

Question

Possible Duplicate:
No facility exists in Update Manager (12.04) to upgrade to 12.10. Why?

I have it set to notify me of all releases of ubuntu.

Answer 1

there two ways to do that

First way you can do it by terminal just copy this command and drop it in your terminal

update-manager -d

Second way is by doing it by yourself "and i prefer this method at least you know what you are doing so you can avoid some mistakes "

1- Open Update Manager from either the Power Menu or the Dash.

2- Click the ‘Settings’ button in the lower-left corner of the Update Manager window:

3- This will open Software Sources.

4- Click the menu next to “Notify me of a new Ubuntu version” and select ‘For Any New Version’.

5- Once you’ve made the change you will likely be prompted to input your user password.
After this, close Software Sources, then close and then reopen Update Manager.

6- You’ll now see the following prompt displayed at the top of the window of update Manager

Important Note : 
* It also pays to back-up any important files and folders before upgrade.

Answer 2

Open a terminal and run the following command:

update-manager -d