If I install 16.04 Beta 1 can I then upgrade to the April 23rd release

[wolfman]

You would be better off doing a full clean install using the "Something Else Method" rather than just updating:

Install Ubuntu-MATE using the "Something else" method

Hi all, this guide can be used on any Ubuntu based system and is intended for people who have a basic working knowledge of an Ubuntu installation and wish to keep the contents of their home folder after doing a re-install. This guide is also intended for those that already have an existing swap, root and home partition setup!!. If you have not done/never done any pre-partitioning, please see this guide about using Gparted partition editor: See also: https://help.ubuntu.com/community/Howto…