How to upgrade 14.04.3 LTS to 15.10 (wily)?
sudo do-release-upgrade -d
offers upgrade to 16.04 (xenial), which is in beta current.
(It is a server, no GUI.)
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You need to edit the following file
sudo vi /etc/update-manager/release-upgrades
and change from
This will allow you to upgrade to the next release which is 14.10 and then you can rerun the command to upgrade to the next.