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The short answer is that you can't do it. Microsoft has not released Office/Word for Linux, and instead of trying to get it to run on the machine you'd be better off just installing a free alternative office suite like LibreOffice.
LibreOffice is compatible with Microsoft Office and can create documents in the Word format and open Word documents, and it's designed to run natively on Ubuntu.
If you're not familiar with LibreOffice, you can read more about it at www.libreoffice.org.
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