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This question already has an answer here:

I installed Ubuntu 12.10, after few minutes of working I've got an Update and allowed it.

After this I see that Ubuntu has been upgraded to 13.04. Why?

I am not a developer, just try to work.

In Software sources in one of tabs there is an repo. Is this responsible for updates to 13.04? If I disable those will the problem be gone?

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marked as duplicate by ændrük, Eliah Kagan, Kevin Bowen, green7, Basharat Sialvi Apr 13 '13 at 11:54

This question was marked as an exact duplicate of an existing question.

Where do you see it is 13.04? – Eric Carvalho Mar 3 '13 at 17:18
in system details and few things are diferent – alienowo Mar 3 '13 at 17:44
Are you sure you downloaded the right ISO file? Did you get your download from ? – Gladen Mar 3 '13 at 18:25
It doesn't. If you think it has, you will have to be more specific about why. – psusi Mar 3 '13 at 18:25
i download Ubuntu 12.10 x64 from ubuntu download site. all I want to know is why my Ubuntu after each install updates to 13.04 version – alienowo Mar 3 '13 at 18:41

i don't think that its automatic update as 13.04 on beta

Because the ubuntu 13.04 is still on beta test , so it's not offcial released if you want to update to ubuntu 13.04 beta

open terminal , and type this ( this is the easiest way )

sudo do-release-upgrade -d

any way its not bad to test beta as on 27 april its offcial released and u can update it

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