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I try to upgrade my Ubuntu 12.04 to 13.04 (or upper why not). I read in release notes that I should first upgrade to 12.10 before 13.04.

But when I use the update-manager -d command, the program purposes to install only the release 14.04. How can I chose the target version ?

(I tried to upgrade to 14.04 but I had an error message:

W:Impossible de récupérer http://extras.ubuntu.com/ubuntu/dists/trusty/main/source/Sources  404  Not Found
, W:Impossible de récupérer http://extras.ubuntu.com/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found
, E:Le téléchargement de quelques fichiers d'index a échoué, ils ont été ignorés, ou les anciens ont été utilisés à la place.)
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    14.04 is in development and thus not supported here. If you wish to test 14.04 I suggest you do a fresh install on a test box/partition/virtualbox or similar. – Panther Nov 1 '13 at 17:46
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This method allows a step by step upgrade:

sudo apt-get update
sudo apt-get install update-manager-core
sudo do-release-upgrade

found here and here.

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