Remapping keyboard shortcuts (copy, paste etc) to Alt key instead of Ctrl

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http://askubuntu.com – Interestingly, it turns out this is almost impossible to do. Remapping Alt key to behave as Ctrl key is not a solution because you lose the Alt key functionalities (some of which are essential, like Alt+Tab). The behavior I am trying to get is the behavior of the MacOS where cmd key is used for keyboard shortcuts (but also for switching between windows with cmd+Tab). Sure, I can assign Ctrl+Tab to switch between windows after I remap Alt key as a Ctrl key. But then I lose the real Ctrl+Tab functionality in some applications, which are also critical like switching tabs in Chrome. Basically my (HowTos)