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Acquiring pre-releases/betas for unreleased distros for testing
October 13, 2016
November 24, 2022
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You can download Ubuntu 16.10 beta version from here: http://cdimage.ubuntu.com/ubuntu-gnome/releases/16.10/beta-2/
However be advised this has been in Alpha and then Beta for quite some time and the production release is scheduled for October 14th, 2016 (I think) so you need to act quickly!