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I do have a machine running 15.04 and while trying to use do-release-upgrade to upgrade it I realised it is forcing me to get 16.04 which I don't want because I know that our code doesn't work well with the updated Python from it.

How can I do this upgrade? (console only)

Update

It seems that even doing an upgrade to current version doesn't work anymore!!

 An upgrade from 'vivid' to 'xenial' is not supported with this tool.

Update: it seems that do-release-upgrade -d did upgrade to 15.10 even if it did have the impression that it will upgrade to 16.04.

PS. Shame on those that voted to close the ticket instead of providing answers.

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closed as off-topic by Byte Commander, user68186, TheWanderer, Pilot6, karel Jul 29 '16 at 10:35

This question appears to be off-topic. The users who voted to close gave this specific reason:

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@ByteCommander No longer supported means that we are in deep.... If it's not possible to upgrade to it, please make it an answer and put a link to document that explains it. – sorin Jul 29 '16 at 10:20
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There is no direct upgrade path from 15.04 to 16.04, you must go over 15.10 first. See askubuntu.com/questions/91815/… – Byte Commander Jul 29 '16 at 10:36
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This is the top search result on Google for "upgrade from vivid to xenial not supported with this tool". As someone who is trying to resurrect an old 15.04 machine without reinstalling, this question is both on-topic and useful. – kd8azz Dec 19 '16 at 2:04
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For a stack Exchange whose name is AskUbuntu this is a comment that sounds disturbingly like "sorry you are screwed". I am sure there are plenty of ordinary desktop users who do not upgrade every time there's a new release (because we are not sysadmins, we are people with jobs and families and obligations), To say flatly, sorry we can't help you, seems to undermine the entire purpose of this site. I have been part of several stack exchange sites and I have never seen that attitude displayed. – chrisfs Dec 30 '16 at 19:46
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do-release-upgrade -d worked ok for me to upgrade to 15.10. Just had to update then to 16.04 and finally to 16.10. Up to date at last haha ! – Maxime R. Mar 6 '17 at 19:09