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=== Disable Alt-Tab Window Grouping ===Install the compizconfig-settings-manager using apt-get:sudo apt-get install compizconfig-settings-manager compiz-plugins-extraIn this manager, find the Ubuntu Unity Plugin, go to tab "Switcher" and disable all short cuts and check boxesClick the back button. Now search for "Static Application Switcher" and enable that.Enable its key combinations for next and previous windows Alt+Tab and Shift+Alt+Tab.