Ubuntu – How to perform do-release-upgrade from 15.04 to 15.10 once 16.04 was already released?


I 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 on 16.04.

How can I do this upgrade? (console only)


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 had the impression that it would upgrade to 16.04.

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