What is EPUB?
EPUB i.e electronic publication is an open ebook standard developed by International Digital Publishing Forum(IDPF).The EPUB files have the extension .epub.The EPUB is designed for reflowable content i.e the text display can be optimized for the particular display device used by the EPUB Reader.For Ubuntu the best software for reading EPUB file formats is Calibre.
Recommended EPUB Reader : Calibre
Calibre is a ebook library management software and it can read all the common ebook formats.It is free and open source software.In ubuntu you can install it directly from the Ubuntu Software Center or Synaptic Package Manager.If you have any problem in installation then go to the link given below and come back if needed.
After completion of installation,open the *.epub file with Calibre or add the *.epub file to the calibre library from the options given in calibre.Then you can read the epub files in single click from calibre.