I want to perform an upgrade from 14.04 to 15.04. When I run "sudo update-manager -d" I get "... However, Ubunutu 16.04 LTS is now available(you have 14.04)" I think that this nighly build 16.04 is not yet stable. How to upgrade to 15.04 and not 16.04?
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Use update manager without the "-d" option. See man update manager for details.
The -d option means update to development release.
-d, --devel-release Check if upgrading to the latest devel release is possible
http://manpages.ubuntu.com/manpages/precise/en/man8/update-manager.8.html
or run
sudo do-release-upgrade
