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Before you guys close this question as duplicate, I did go through How do I upgrade from 12.10 to 13.04? and nothing solves my problem there.

When I try to upgrade my ubuntu 12.10 installation it says

The software on this computer is up to date.

There are no upgrades available for your system. The upgrade will now be canceled.

Here's a snapshot:

enter image description here

Question: how to fix this issue and upgrade 12.10 to 13.04?

Update

I tried @montazeri's command and cated release file. Here's the output:

enter image description here

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1  
No! it's not. Methods defined there aren't working! I have a weird error –  codefreak Jul 3 '13 at 8:00
    
What happened after you clicked close? Have you tried running the upgrade again? –  Oli Jul 10 '13 at 8:39
    
yes I did try to run again and again. After I clicked close, process just closed. Nothing else... –  codefreak Jul 10 '13 at 11:15
1  
How about upgrading from the command line. Try a sudo do-release-upgrade. –  Oli Jul 10 '13 at 11:16
    
Need to go to the Chat room to help. –  Andrew Jul 10 '13 at 13:27

2 Answers 2

I would first try

cat /etc/lsb-release

and make sure the it prints the version you should be running. Assuming it is, try

sudo apt-get update && apt-get upgrade

to ensure all necessary packages are up to date. Then perform a

do-release-upgrade

from the command line. If that doesn't work try

apt-get dist-upgrade

prior to installing the release upgrade.

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I already mentioned I tried all this. –  codefreak Sep 8 '13 at 14:32

Question here, have you tried looking at the System Settings > Software & Updates information? Specifically on the updates tab, look at the drop-down where it states:

Notify me of a new Ubuntu version:

If it does not say 'For any new version' but instead says anything else, then this would occur.

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