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Why is “No new release found” when upgrading 10.04 to 12.04 LTS?
Can't upgrade ubuntu server from 10.04 LTS to 12.04 LTS

I have followed the instructions to set my Update Manager to check for release upgrades, i.e In Software Sources -> Updates -> Release upgrade it is set to "Normal Releases". I am happy to go from 10.04 to 11.x then to 12.04 as recommended, but it simply will not find any upgrades available.

I have also tried running

sudo do-release-upgrade -d

It says

Checking for new ubuntu release
No new release found
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marked as duplicate by Uri Herrera, Eliah Kagan, Mitch, jokerdino, RolandiXor Aug 12 '12 at 20:23

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

    
I saw this question and followed its instructions as shown in my question. It did not solve my issue. – Nick Barrett Aug 10 '12 at 3:53
    
In that case i would recommend simply burning a 12.04 disk and installing it. If you do not tell it to format the partition containing your home directory and enter your old username and password then none of your data should be lost, you will need to reinstall all your applications however. – Alex L. Aug 10 '12 at 3:57