A file saved with the .epub is a file format used for storing files as eBooks and other types of content. EPUB is the short name of electronic publication and named the official standard of the International Digital Publishing Forum (IDPF).
EPUB files can store words, images, sheets, fonts, metadata details, and tables of content. They are considered layout agnostic, meaning that screen size doesn’t affect the formatting—EPUB files can display content on screens as small as 3.5″. This and the fact it’s a freely available standard is why a majority of eReaders support EPUB files.
In Ubuntu, you can save your file or document i.e. text, image, table of content in EPUB format by clicking on "export as" tab in "File" menu. However to open these files you need other software to install. I tried to open pdf viewer, image viewer, Libre office files system and it could not open. Hence, I look to internate and i found that it is suitable for Kindle to read ebooks.
How to Open an EPUB File
EPUB files can be opened on a computer with several free programs, such as Calibre, Adobe Digital Editions, Apple Books, EPUB File Reader, Stanza Desktop, Okular, and Sumatra PDF. In addition to a few of the programs just mentioned, Mac users can read EPUB files with Readium. Google Play Books is another place you can open EPUB files by uploading them to your Google account and viewing it through the web client.
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