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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.

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marked as duplicate by stephenmyall, Mik, Amith KK, Takkat, belacqua Oct 19 '12 at 19:46

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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.
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Open a terminal and run the following command:

update-manager -d
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That allows install of beta – Kyle Macey Oct 18 '12 at 17:39
You will need to wait for your (regional) download server to receive final release Ubuntu 12.10 .. eg. a few more hours. Otherwise, download yourself, as Torrent. – david6 Oct 18 '12 at 19:12

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