EBook Viewer Quick Start on Ubuntu Linux
How to Install Best Ebook .epub Reader for Ubuntu 15.10 Wily Werewolf GNU/Linux desktop – Step by step Tutorial.
Calibre is a Free and Open Source e-book library management application developed by users of e-books for users of e-books.
 
How to Install eBook Viewer on Ubuntu
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By the Ubuntu Software Center: 
 One Click Install
 After simply Confirm to Open and Install by the System Package Installer…
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By the Terminal Shell: sudo apt-get install calibre If Got “User is Not in Sudoers file” then see: How to Enable sudo 
