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http://www.webupd8.org/2014/11/how-to-use-compiz-in-ubuntu-mate-1404.html

sudo apt-get install compiz compiz-plugins compizconfig-settings-manager

launch "compizconfig settings manager" => Ubuntu Unity Plugin => Switcher (allow disabling of Default Switchers):
  Switcher all viewports => <Alt>Tab
  Previous window Switcher all viewports => <Shift><Alt>Tab